Database Develop

Can't connect to PC via USB

Help!
My optimus 2x is not detected when I plug it to my laptop via USB.
Turn on mass storage" in the phone does not appear, it's like I'm just plugging in into a wall charger.
It could connect just a few days before, same laptop, same drivers (LG mobile united drivers)
Have tried it with 3 different laptops, still can't connect (drivers are installed)
A google search reveals other people having the problem as well and unable to solve it.
Can't return it yet for warranty because superuser app is still there.
Originally, I rooted it using superoneclick. Can't unroot it in superoneclick since not detected in USB.
So i unrooted it using z4root (without a pc). It's now unrooted, however superuser app is still in the app drawer.
Any advice?

Hi, I have the same problem and I posted question here: http://forum.xda-developers.com/showthread.php?t=1274379
Maybe some answers can help You but in my case nothing helped until one day it suddenly started to work again.
Well it was working both on my home and business laptop until few days ago when it stopped. I can+t make it to work again, and I've tried last advice there to remove battery for about 20 min.
I think problem is in the phone, because one day when it started ti work again on my business laptop it was also working on my home laptop without any action taken.
Please help!
P.S. I can hope that when GB will be available through OTA (I can't count on update tools because my phone is not detected), it will solve the problem

Thanks. Will try those suggestions. Not sure if i can update to gingerbread OTA. Theres no OTA update in my menu.

Hi,
I have the same problem as well. Nothing shows up in Device Manager, no notification when I plug in the phone. Just charging.
It was working just fine right out of the box, even before I installed any LG drivers, but it's suddenly just stopped being detected by the computer. Mass storage only or usb debugging makes no difference.
The problem is not with any of my USB ports, as other devices work just fine when plugged in (my iPod pops right up in Device Manager). I've reset the phone to factory stats, tried with other computers, downloaded the most recent drivers as well as the LG Mobile Support Tool.
I've googled extensively, only to find that a lot of other people have the same problem, but no working solutions.
I appreciate any and all suggestions.

Same issue.
Even on cwm and i can't make software update (power + vol- = reboot loop).
So i use adb tcpip...
I think i should try a stock/modaco before send it to after sales service

Thanks michoux.
Can you point me to instructions on flashing via adb tcpip?
edit:
Just did some googling. it seems device needs to be rooted for adb via tcp ip to work right?
Unless there's a way to root without pc then I can't do anything. (z4root doesn't work).
Damn, first mistake i did was to unroot.

do you already have installed the driver?? if already install remove it first and then reinstall the driver
check out this link maybe can help
Code:
http://forum.xda-developers.com/showthread.php?t=1304934&page=2

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SOLUTIONS that worked for me - Unbrick, from Rom to Factory, to Cyanogenmod

I just wanted to relay my experience for anyone who might run across the same problem. There are so many solutions (some good, some bad) that I thought I'd try and help someone else out that was in one of these situations. Keep in mind, the solutions are all here at XDA, I just had to dig and try a few things.
This Captivate was on a Ginger Clone rom (2.2) from about a year ago and I wanted to go to Cyanogenmod. I personally run Cyanogenmod7 (181), and was trying to replicate that.
[Boot-Loop]
I Attempted to clear caches and go straight to Cyanogenmod. This may have been an inexperienced guess that I might be able to do this, but I know a few other folks that manage to do this. I ended up in a boot loop
[Getting to Download mode]
Can be frustrating, but seems to be if you have the usb unplugged, battery out, sim out, put the sim in, battery in, usb in (phone will turn on, so you have to move fairly quickly) and then hit the up and down volume buttons it will go into download mode.
[Go back to Factory]
I tried using the Odin 1 click solution. I believe there are more than 1 versions of this, but it would just get stuck at "Do not turn off target". I decided to try something else. The Java based Hemidal 1.3 aka "SamsungCaptivate-SGHi897-UCKB2-Rooted-One-Click.jar" seems like it is very well written and very easy. It has you update a driver in the mix and it works fantastically.
[Now I'm at Stock 2.2, rooted]
Need to turn on USB debugging, and I was expecting to be able to put
on the rom manager by copying over a file, naming it update.zip but it won't run due to some signing restriction.
[Unable to run any scripts or update.zip]
http://forum.xda-developers.com/showthread.php?t=833423
Basically, you need to turn off signing
[Went off the tracks, bricked the phone]
I decided I would try and apply the Cyanogenmod rom a different way. I went to their wiki and tried to use their Hemidal 1.1.1 update suite and script. I ended up with a brick. I didn't panic, I used the below url and it worked to get me back into download mode. I then used the previously successful Hemidal one click to fix it.
http://www.traemcneely.com/2011/05/...e-possibly-vibrant-kernel-error-black-screen/
I went back to the 3e recovery installer, ran that script, it worked and let me run unsigned code, I installed rom manager via update.zip, and from rom manager I was able to apply Cyanodenmod 7-v181 and then the Google apps and I was happy. Took about 2 1/2 hours to go through all that. Kind-of a pain... happy now.
Rich

Wish I had your kind of luck
I have a Captivate that isn't "bricked" per say but when I plug it into my computer when it's in download mode I only ever get "unknown device". Forcing a driver install causes a code 10 which makes it unusable as well. I have tried 4 different cables and 3 different computers now and tried all of the USB ports on each of the computers I tried at and always get unknown device even with the correct drivers installed. The 3 button trick doesn't work to put it in download mode but using a jig does. I have tried every operating system combo as well heimdall in OSX and Linux says no device connected, and in Windows 7 32 bit and 64 bit I get the unknown device error, also tried Windows XP and get the same error. I have tried 4 different usb cables now as well in each situation with the same unkown device/no device connected error (2 motorola cables, 1 samsung oem cable, and one no-name cable). I was going to gift this to my Dad because he's been missing Android since he gave his HD2 away and went back to a Blackberry.

USB issue

Hi,
I currently encounter a problem with my Optimus 2X.
I can use my usb port to load the phone but when I plug it in a computer (I tried with several computers running XP / seven / ubuntu ... and several cables). But my phone doesn't seems to be recognized by the computers.
I'm running 2.6.32.45 cyanogenmod. I wanted to go back to the original rom but my backup seems corrupted
Does anywone knows how I can go back to the original rom ? (hopping it will fix my usb issue ....)
regards.

Uninstall the old drivers, and download v3.6 from lg's site it has fixed this issue. =P
Sent from my LG-P990

Even if the coputer act like there is nothing plugged ? On several computer I used the phone wasen't recognized as a plugged peripheral (even a usb key).

I had the same problem, v3.5 of lg united driver was cqusing it , when I updated it got fixed just uninstall reboot and install 3.6 worked for a few more peps
Sent from my LG-P990

Thank's a lot it works perfectly !
I now encounter a new problem, when I try to update my phone using the LG software, it stops at about 30% (looks like it's impossible to connect the phone with the software).
Edit -> I've found an old stock rom and installed it on my phone : everything works perfectly thanks a lot !!!

Guys
I'm running CM Nightlies and I can no longer connect my phone to any pc via USB.
Some have said I would have to flash phone back to an original rom in order to fix then flash CM back over it?
Is this really only way as worried will lose all my internal drive stuff.

You can try to change your drivers it works very well !
If you wan to save your stuff without using USB you can use FTP thrue à WIFI to send stuff on your PC.

I got the same problem since about 4 months. When connecting the phone to the computer, no usb icon appears on the notification bar, also there is nothing happening in the device manager on the computer. Charging always works.
This is still confirmed after using different computers, different usb cables, different usb ports, and 4 different versions of the drivers (up to the most recent 3.6 drivers) even it should still show something even with no drivers. This also occurs in "software update" mode.
Also I tried different ways of plugging in the cable on the phone side (slow, fast, with pressure up/down/side).
This is with CM7, CM9alpha, and just for test also with MIUI.
The odd thing is, in this time span, it randomly worked about 4 times in these 4 months. Last time was just after I updated to CM9 alpha it worked the first time I plugged it in (was surprised with that), but it stopped working too.
For me it seems it's something with the usb chip set in the phone.
The problem here is, returning the phone for RMA will cause problems with CM on the phone, as they probably will say it's because of a custom rom, and there is no (easy) way to get stock rom with branding back on the phone (the only one maybe with a nandroid backup of stock from someone else?).

I'm having the same trouble as dedors. Absolutely no USB data connection. Can't get anything going in nvflash, smart flash, recovery, or when running normally. I've tried uninstall and reinstall the drivers, multiple cables, multiple computers, multiple OS including win7 xp and Ubuntu. USB debugging enabled, disabled, wiping the SD cards, trying with no external sd card. The only glimmer I've seen of it working was when I plugged it into my old XP laptop before and it prompted the computer to install a driver for the webcam that I'd mistakenly uninstalled. I tried cleaning out the USB port in case it had a bunch of lint stuck in it and the cable just wasn't sitting properly.
I don't know at what point it stopped working but it has had no serious abuse that could cause any physical damage.
Oddly it still charges just fine.
Can't return for RMA as it's running Cyanogen 9 and I've no easy way to get it back to stock. I also had this problem on Cyanogen 7. I could probably flash a stock rom onto the phone but I wouldn't be able to nvflash the original recovery.
A lot of people seem to have had USB trouble with this phone.
Happy to provide any logs that may help the diagnosis though you may have to explain how I can acquire them as I only know basic flashing.
Sorry for the lengthy first post, trying to be thorough.
Thanks in advance for any help offered.

I can't think of any solution to your problem (in my opinion it seems like a faulty USB port, it seems to be "popular"), but I can suggest you a workaround... it's actually the workaround I've been using cuz I also have trouble with USB... get an SD card and a USB to SD card adapter...
Or that ftp/wireless trick that was mentioned above, I actually don't know how to do this but I would definitely like to

Yeah that does seem to be the case. At least I can still flash roms and so on. So long as it lasts me the rest of the year I don't mind grabbing a new one then.
Anyone who knows about logs for trouble shooting, can you suggest a way that I might try to diagnose the problem. If I can be sure the port is stuffed and nothing I can do will fix it I'm ok with that but I'd like to know whether I should keep looking for solutions or give up on it.
Cheers.

Hello,
I've got a new issue with my phone updating CM10 and today it's impossible to boot.
I've tried to plug it on my computer in order to flash it but got the same probleme as the first post : nothing happened when plugged on my computers.
Does anyone got this 3.6 drivers somewhere ? seems that the new ones from LG didn't works ....

I have the same problem
I how bought my phone (LG P990), 6 months old, used. I come home and try to connect it to the computer and it won't be recognized. Somehow I manage over that code 1809 # * 990 # to enter the menu and play with the ports I was able to connect to the computer and do the official update to 2.3.4. over LG software.Once again, this comp will not recognize phone (only charging), but using code 1809 # * 990 # and tampering on port settings it was able to connect to the computer.
Now after some time do stupidity and Root my mobile phone(SuperOneClick) and install clockwork-5.0.0.3 and via zip CyanogenMod 9. I tried all the ways that exist but pc does not recognize the phone anymore. After some time, the official ICS update is coming, and now that you can not connect the comp how to update mobile phone. I do a recovery back to the official Android 2.3.4 (I had to change the partitions, 2.3.4 and ICS use different sized partitions) and I run a mobile phone that is again official 2.3.4 and try entering the menu (1809 # * 990 #) by tampering with ports settings I tried to make comp to recognize the phone but to no avail. I tried to change the usb cable, use a different USB port on comp but nothing, no response just recharging.
After googling I managed to find recovery from ICS V28g and I managed to install it to have a functional phone. I contacted 2 service both refused to accept phone because rooted. I tried all the tricks without battery holding vol + and - to enter into APX mode, nothing then Power and vol - S / W mode that worked but comp ga would not recognize until now even that does not work (appears LG logo and when S / W should appear then goes off) and all the other tricks that I found on the internet, reinstall the drivers, I do not know what else.
Oh yeah and I noticed entering the settings on mobu System Settings / About Phone / Software Information / Baseband version - unknown
Link to image-->h_t_t_p://s1.postimage.org/9317bfezz/2013_01_11_12_36_01.jpg

Hi,
I've found an old 3.6 driver, but nothing works even with it ... I think I must change my phone -_-

USB-connection (Smartflash, NVFlash, Data-transfer)

Hi,
I've search thru the forums and tried several things, but haven't found a solution.
My problem is that I no longer can make a USB-connection to my O2X.
The only thing that works in the micro-usb is charging. What I tried:
- Smartflash (power-up without battery while holding vol-)
- NVFlash (power-up without battery while holding both vol-buttons)
- Ordinary USB-connection (flash-drive)
- Cleaned it for dust
All of this was done on different windows machins (WinXP and Win7), all USB-ports and different USB-cables (inlcuding one that I know has worked before). Windows don't even show me the device.
The reason why I want to flash is that I think the current baseband (that I flashed) is not the best for my phone. So I want to try another baseband.
Do any of you have a suggestion on how to fix my phone or is the hardware toasted?
Best regards
Anders

Unable to install stock rom
DEAR MEMBERS
please help me i am running cm7.2 in my o2x and want to go back to stock rom.
i have downloaded smartflash tool and stock rom fls and bin files and done the entire procedure as mentioned in the guide
but when i press start button it asks to install odm which is not mentioned in the steps.
when i press yes nothing happens when i press no nothing happens.
please help me to get back to stock rom or else i may void my warranty.
once before i installed the stock rom by the procedure and was successful but this time i am unable

First uninstall lg software and lg usb drivers then first install LGUnitedMobileDriver_S498MA21_WHQL_ML_Ver_2.1.exe then run the SmartFlashTool_P990.exe then remove battery plug device in while holding volume down - and them try.

komunistvb said:
First uninstall lg software and lg usb drivers then first install LGUnitedMobileDriver_S498MA21_WHQL_ML_Ver_2.1.exe then run the SmartFlashTool_P990.exe then remove battery plug device in while holding volume down - and them try.
Click to expand...
Click to collapse
Thanks for your suggestion, already tried this. The problem is that Windows don't even pickup on my O2X when plugged in. No new devices in the Device Manager shows up.

aziz.chamadia said:
DEAR MEMBERS
please help me i am running cm7.2 in my o2x and want to go back to stock rom.
i have downloaded smartflash tool and stock rom fls and bin files and done the entire procedure as mentioned in the guide
but when i press start button it asks to install odm which is not mentioned in the steps.
when i press yes nothing happens when i press no nothing happens.
please help me to get back to stock rom or else i may void my warranty.
once before i installed the stock rom by the procedure and was successful but this time i am unable
Click to expand...
Click to collapse
Please don't hijack my thread!

Aduck79 said:
Thanks for your suggestion, already tried this. The problem is that Windows don't even pickup on my O2X when plugged in. No new devices in the Device Manager shows up.
Click to expand...
Click to collapse
Try going to Hardware and Sound and then Devices and Printers in the Control Panel. Maybe it'll show there.

Aduck79
You may try in a virgin PC where no USB drivers have been installed. Best would be format PC reinstalll WIN OS and try NVFLASH or SMARTFLASH after installing LG USB drivers. I have also faced similar problems and solved them in different PCs either friends or office. I somehow feel LGs drivers are badly written and not very smooth functioning. In fact I (and many others) have bricked O2X trying to upgrade to official GB updates by using LG PC suite and drivers.
This is only my suggestion. I did not had to format my PC any point of time. Don't curse me if this fails. This is only one of the trials and errors.

Maybe I should try from a Linux live-cd to check if it's windows or the phone who's acting strangely.
Sent from my LG Optimus 2X

I got the exact same problem and after searching the net there are a lot of people having the same issue too.
Don't want to sound negative but the majority never got it to run again. For some it automagically started working again.
I got it to run only on Stock Froyo, no stock GB and no ICS with all the ICS Kernels available.
The thing which helped me on Froyo was: http://forum.xda-developers.com/showpost.php?p=28985033&postcount=5
Unfortunately CM9 has no secret menu.
I once had it recognized with Jarvis Kernel on Paranoidandroid for a second and had a hotreboot. Then never again.
I'm pretty sure the PC and the LG Drivers make no difference in this case, as I got 5 different PCs running different OS for testing and they never made a difference.

Aduck79 said:
Hi,
I've search thru the forums and tried several things, but haven't found a solution.
My problem is that I no longer can make a USB-connection to my O2X.
The only thing that works in the micro-usb is charging. What I tried:
- Smartflash (power-up without battery while holding vol-)
- NVFlash (power-up without battery while holding both vol-buttons)
- Ordinary USB-connection (flash-drive)
- Cleaned it for dust
All of this was done on different windows machins (WinXP and Win7), all USB-ports and different USB-cables (inlcuding one that I know has worked before). Windows don't even show me the device.
The reason why I want to flash is that I think the current baseband (that I flashed) is not the best for my phone. So I want to try another baseband.
Do any of you have a suggestion on how to fix my phone or is the hardware toasted?
Best regards
Anders
Click to expand...
Click to collapse
I'm afraid without any USB connection at all you are pretty much out of luck I'd say

kohos said:
I got the exact same problem and after searching the net there are a lot of people having the same issue too.
Don't want to sound negative but the majority never got it to run again. For some it automagically started working again.
I got it to run only on Stock Froyo, no stock GB and no ICS with all the ICS Kernels available.
The thing which helped me on Froyo was: http://forum.xda-developers.com/showpost.php?p=28985033&postcount=5
Unfortunately CM9 has no secret menu.
I once had it recognized with Jarvis Kernel on Paranoidandroid for a second and had a hotreboot. Then never again.
I'm pretty sure the PC and the LG Drivers make no difference in this case, as I got 5 different PCs running different OS for testing and they never made a difference.
Click to expand...
Click to collapse
Does the ROM has anything to do with Smartflash- and NVflash-modes? My guess is that they have nothing to do with each other. So my problem should persist even though I try different ROMs. Correct me if I'm wrong.
I'll look into the Froyo-topic you linked to.

Strange. Now it suddenly works again. I didn't do anything from the last time. That's odd.

I don't think that the ROM specifically has to do with the problem.
Stock Froyo just happened to be the only ROM where switching USB connection modes made the device seen in device manager on Windows. (Although it required manual .inf driver clickery.)
I'm sure missing USB connectivity affects people in NVFlash as well.
In my case I can't do **** ranging from USB mass storage when booted up, ADB or NVFlash when booting.
However restoring to the Froyo nandroid makes everything working for me again.

oh oh, it looks like the same issue that i had... No PC-connection (Win/Linux) recognized the mobile via USB. No Chance to get it back to work.
I flashed back to stock (very difficult without NVFlash...) and then send it back LG Service for repearing. After three weeks i got it back. They changed the hole mainboard so i got a new IMEI but USB works now again.

zeonit said:
oh oh, it looks like the same issue that i had... No PC-connection (Win/Linux) recognized the mobile via USB. No Chance to get it back to work.
I flashed back to stock (very difficult without NVFlash...) and then send it back LG Service for repearing. After three weeks i got it back. They changed the hole mainboard so i got a new IMEI but USB works now again.
Click to expand...
Click to collapse
Yeah. It stopped working after I booted a couple of times
And it was only semi working, it didn't want to go into Smartflash-mode, only NVFlash and Flash-drive.

@aduck79,
Did you already try tonyp's modded adb drivers?
http://forum.xda-developers.com/showthread.php?t=1752074

aragorn7 said:
@aduck79,
Did you already try tonyp's modded adb drivers?
http://forum.xda-developers.com/showthread.php?t=1752074
Click to expand...
Click to collapse
Nope, as I'm quite sure that it's not a matter of drivers.
Windows don't even detect the phone. So I think that the phone doesn't present itself.
Sent from my LG Optimus 2X

Since you already tried changing cables, computers, and even windows & Linux, and since it works on and off, You're right - it isn't the rom nor the drivers. it does sound like the hardware is messed up where the cable connects.
Any chance you can get it serviced? Hope your warranty covers it.
Sent from my LG-SU660 using xda premium

Same problem, no solution
Hi,
I seem to have the same sort of problem with my phone.
I used to be able to connect my phone to my computer just fine until I upgraded it to Gingerbread. Or that is at least the last time the USB connection seemed to work.
I have looked all over the internet now to find a solution to the problem but can't find one. Hope you guys could help me on this.
My phone is an LG optimus 2x P990 with a stock ROM gingerbread 2.3.4
LGE Version LGP990-V20r
Kernel version 2.6.32.9
I've tried so far:
- rebooting phone and pc
- factory reset phone
- Use other pc's => didn't work
- Connect a samsung phone to my pc with my LG cable => did work
- uninstall and reinstall all the necessary drivers
- mass storage mode on and off
- Installed android SDK and looked for adb devices, none shown
- phone doesn't show in the computers device manager either
Although when I do connect the phone it starts charging and if I go to the tethering settings it does recognize the fact that it is connected through USB.
So why can't I get my PC to recognize the phone.
I really need it cause I would like to root my phone to install a custom ROM.
I have tried rooting it with Gingerbreak as well, but that doens't seem to work either.
Thanks for the help

I just made a recovery.log in CWM:
http://pastebin.com/yJw6LEmf
It mentions something about USB in the bottom. Maybe it's a software issue after all?
Sent from my LG Optimus 2X

[SOLVED] No USB sync, only charge O2X

Ok Guys, I started this thread because last weekend I had an interesting issue with my O2X. From one day to another, whenever I connected my phone to the computer it only charged, I had no USB connection. I’m not yet quite sure why it happened, the last thing I did to my phone was install CM10 nightly of 31 October 2012, and then I changed the default baseband I had (725) to the one GetRil was telling me to install (LGP990AT-00-V20l-EUR-XX-OCT-20-2011 0_CP) (this baseband didn’t fixed the strange noises of in call) two days after that I got the no USB bug, at first I thought it was software related, then after lots of reading and trying different cables and computers I thought it was hardware related, but then I saw an interesting chance of fixing it, and it did in my case
Credit goes to Kohos, I manage to have USB fixed temporary thanks to his post on modaco.com
I’M NOT TELLING THAT CM10 CAUSE THIS BUG, IT JUST HAPPENED TO ME WHILE USING THIS ROM
Specs
Phone: Optimus 2x (p990H made in south Korea)
Rom: CM10 Oct 31 2012 (when got the bug) now CM7 nightly 15 July 2012
Kernel: Symbiosis 2.6.32.59 v1.2
Carrier: Telcel
Country: México
Ril: 0725 (V10d, Europe)
BB: 1035.21_20110725
CWM: 5.0.2.0 (no touch version)
To solve this issue you need to have a stock ROM that can be flashed by CWM. Can be the rom, or a backup of the stock rom (If you don’t have one send me a PM), I didn’t tried stock-based ROM so those may or may not work; I’m not sure but rather use an original stock ROM. You also need to be able to enter CWM recovery, and have LGE drivers up to date.
For this method I used a stock nandroid backup.
I’ll describe step by step all I did to solve this issue so you can give it a shot:
1. If you have a flashable stock rom you may skip this step and go to step 3, if what you have is a nand backup you need to make your partitions back from EXT4 to EXT3 (this is the format that stock rom uses) so need to download the tool R2 found on the first post here:
http://forum.xda-developers.com/showthread.php?t=1021549
put it on your external SD card along with the backup of the stock rom
2. Reboot to enter CWM recovery and install the tool R2 (NOTE: this will erase all information of the internal memory)
3. Install or flash your stock rom or backup (In case you're using my backup, keep in mind, my file IS NOT a flashable rom, it is a backup, so trying to use the option "flash zip from external sd card" WON'T work, what you need to do is unzip the file and put it on sdcard/clockworkmod/bakcup, then on the recovery, you have to use the option "restore from external sd card", that way it should work, keep in mind that if you change the name of the file it will give md5 error for the name won't match the backup's md5)
4. Reboot and start the phone, once it is all loaded, on the phone app dial: 1809#*990# this will take you to the service (hidden) menu (If it doesn’t take you automatically to the service menu (without clicking dial) you’ll need another ROM or backup)
5. In this menu you’ll need to scroll to the option: Module Test > USB Mode Selection, in there make sure the option LG Android USB is selected
6. Then go back to the root of the hidden menu, and go to Port settings, there you’ll see several options, the ones we’re interested in are: AP USB, CP USB, AP UART, CP UART, the default should be AP USB, you can start playing with those options. (While doing this, you might want to play with your computer device manager scanning for hardware changes, that might help detecting the USB)
The recommendation is to select CP UART, wait, if your problem is not hardware related, it should popup a message of new unknown device, or LGE Platfrom Android USB device. If your USB show some life signal, then you’re almost done, if not, keep playing with the four options until you see some life signal.
What I did was select CP UART, click Ok, wait, AP UART, click OK, wait, CP USB, click OK, wait, AP USB, click OK, I waited here about 1 min, and then on the computer device manager I scanned for hardware changes, and suddenly my computer started installing all drivers again, this last option is the one that must keep selected even with reboot of the phone.
7. Once you get all done, reboot the phone and connect it to USB to see if it is recognized again, if not, repeat steps 4 to 6
8. Ok, If everything went fine, you should now have USB connection, now I would recommend you flash your Stock Rom, so everything that might cause this bug gets fixed (if you don’t do this, you might get the bug back eventually). To do so you might need to turn off your phone and plug it to your computer while clicking PWR and VOl- at the same time, if your computer doesn’t recognize your phone, use the device manager and scan for hardware changes, this should reinstall the driver needed to make this happen.
9. Finally I restored my last nandroid backup through cwm
I did this on Monday, and two days later I had no USB connection again, I repeated this steps and I had USB detection once more, today it happended again, and repeated the steps so I’m pretty sure this fix should work every time.
NOTE: This is a temporary fix, I've been trying to identify why the bug keeps comming back
Hope this help you all get over this serious bug :laugh:

Updates
This is my last froyo teclel stock backup
http://www.4shared.com/zip/AEVLSE34/2007-02-01000516.html
http://dl.dropbox.com/u/7867872/2007-02-01.00.05.16.zip
Disclaimer: Even though I'm sure it will work, try it at you own risk, I'm not responsable for any bad behavior or damage that could happen to your phone
UPDATE:
Ok, guys I told you I would make some test to make sure the bug won't come back or identify the problem, what I've found so far is that the problem might be caused by the wall charger (but might not the the only reason), If I'm not wrong, the LG stock charger has output of 5.2V - 650mA DC and I've been using a motorola charger (5.1V - 850mA DC output).
Four days ago I started charging my phone only with my computer (usb port has output of 5V - 500mA) and I've had no trouble at all, the bug hadn't come back, today I charged my phone with the wall charger and the bug immediately came back, so for now that's my theory, the wall charger, stock or not, might fail and deliver more current that the O2X need so it mess the phone, I'm going to make fix on my charger to prove my theory, (I have no money for a new charger xD, but I'm studying electronics) if it fix it, I'll let you know, but you can try and charge your O2X with your computer for a day or two to help me prove my theory or prove me wrong
UPDATE:
It's been some time since I last posted here, I've been busy with my finals, but have had some time to make some tests to my phone. On my last update I told you that I had a theory about the bug, well, so far I can tell you that the wall charger indeed have something to do with the bug, but its not the cause of it, I've been using my wall charger letting my phone connected all-night long and the bug seems to happen again, but letting my phone connected to the PC for a while allows the USB sync and debugging again, so I'm not sure why it happens, I'm about to finish my finals so I'll try to make some tests once I'm done, hope this giude help you
UPDATE:
Well, as I was testing my theory, I go back to zero, this is because, my phone, doesn't have the bug anymore, so I have no chance to keep testing solutions for it, the conclusion I got with this is that the wall charger doesn't create the bug, maybe it triggers it, but not always nor on every device because, I haven't sopped using the same wall charger and the bug haven't returned, the last thing I did was, use my computer to charge my phone for three days, always letting it charge to 100% (unless I have to move from the computer) and the bug didn't happened, then, on a rush I had to use the wall charger, the bug appeared instantly, and then keep charging it with the same charger, two days after that, the bug dissappeared, I made no rom change, nor baseband, nor ril, nor anything, just like that it disappeared, so, I have no way to keep testing, if it ever comes back, I'll make some tests again, but for now, I have nothing to work with, hope this thread help you to get over this bug, at least, for a while, I'll be reading this thread in case you have some trouble with the instructions or so, cheers
UPDATE:
Ok, so I deleted long ago the last backup you told me was not working, and since I went to CM10 from Pengus I haven't had the no USB bug, so, one person asked me for the backup, I just made a new one, (this one is 204 MB on zip, read step 3) and uploaded it to 4Shared and Dropbox, so, remember to read and follow the instructions as they are, hope this time you can restore this backup, and one more thing, this backup was made just after installing it on the phone, so it doesn't have even a gmail account, you have to put yours and update market if you need something from there, ps. dont mind the date of the name of the file, it is innacurate, cheers

I don't have any stock ROM backup that I can flash via CWM, can I use this instead?
http://forum.xda-developers.com/showthread.php?t=1617458

To be honest I don't see a big difference to my post you probably found while searching except that your version is waaaaay more to read.
kohos said:
when dialing the above mentioned 1809#*990# in the Port menu, switching from default AP USB to AP/CP UART gave me life signs.
After switching to AP UART I linked the Unknown device driver to lgusbdiag.inf located in C:/ProgramFiles(x86)/LG United Mobile Driver.
Suddenly it started installing it and is now recognized as: LGE Platform Android USB Device.
Once disconnected I lose USB again, I'm able to recreate the first steps though even in default AP USB mode by now.
Click to expand...
Click to collapse
But that aside I hope you realize that this is not a solving fix at all. All it does is giving people who got a fresh device the chance to flash a custom recovery. That's all. It won't work with any CM ROM and even Stock based ROMs.
Unless you have an early Froyo version flashed you will also have no ADB and it won't be recognized during the NVFlash process rendering it pretty much useless.
Having seen dozens of people having this particular problem where all the super obvious stuff like other cables, other pcs, other drivers etc. did not work, sending it to repair was the only fix I heard of solving this problem to date.
Of course I'm very curious on how you are going to identify the problem. Good luck.

kohos said:
To be honest I don't see a big difference to my post you probably found while searching except that your version is waaaaay more to read.
But that aside I hope you realize that this is not a solving fix at all. All it does is giving people who got a fresh device the chance to flash a custom recovery. That's all. It won't work with any CM ROM and even Stock based ROMs.
Unless you have an early Froyo version flashed you will also have no ADB and it won't be recognized during the NVFlash process rendering it pretty much useless.
Having seen dozens of people having this particular problem where all the super obvious stuff like other cables, other pcs, other drivers etc. did not work, sending it to repair was the only fix I heard of solving this problem to date.
Of course I'm very curious on how you are going to identify the problem. Good luck.
Click to expand...
Click to collapse
I'm extremely sorry, there's one think I missed, give you credit (fixing that right away), I actually found your post on modaco.com, and tried to access to the hidden menu from CM7 with no success, fortunately, I do have an early froyo backup that can be flashed through CWM, the only thing is that is the Telcel stock rom (I don't know if this can work with other O2X devices, I think there should not be problem at all)
About ADB, it work in full with the latest drivers installed and scanning for hardware changes on the computer device manager, It even work entering the S/W update service on the phone (to install a stock rom)
I know that many people have had this issue, I spent a lot of time reading forums and stuff about it, the only post that actually helped me, was yours, so, credit is yours, I did this post to show people what I excactly did (that's why is a lot to read, but I wanted to make it as easy as possible to follow up)
To identify the problem is a long and slow task, so, I'll be making some tests and let you know what I found, right now I have no much time, 'cuz I'm about to start my final exams, so I'll be busy, but as soon as I finish I'll be more dedicated to it, I'll be making hardware and software tests but can't promise anything yet

vanmarek said:
I don't have any stock ROM backup that I can flash via CWM, can I use this instead?
http://forum.xda-developers.com/showthread.php?t=1617458
Click to expand...
Click to collapse
I tried to use that ROM, but couldn't manage to download it (I think it was removed, if you want to give it a shot try to find another flashable stock rom or backup, if not, give me some hours to clean my bakcup and upload it somewhere to let you use it, (it is mexico's telcel stock rom, but it should work)

Well Thanks ocr66 for this wonderfull news. I have the issue with usb connection from long time and i will give a try to your fix. You can post a stock rom here or a link to a rom that works??? In order to instal this fix i could lose the root??? Thank you 4 all!

vladutz9 said:
Well Thanks ocr66 for this wonderfull news. I have the issue with usb connection from long time and i will give a try to your fix. You can post a stock rom here or a link to a rom that works??? In order to instal this fix i could lose the root??? Thank you 4 all!
Click to expand...
Click to collapse
It all depends on what you install, if you manage to install stock rom through CWM or another recovery, yes you will loose root, but will have usb connection so you can root again, later today I'll upload my own froyo stock backup (it's mexican stock for telcel carrier, i think it should work out of méxico, maybe could cause network trouble on other countries, but its just a posibility, the important thing is that you be able to access the hidden menu), this backup I'll upload can be installed through cwm and its already rooted, so its like installing any custom rom, you'll keep your recovery and root
Remember, this is a temporary fix yet 'cuz I still get the bug comming back, maybe its because I am restoring my last working cwm backup, the only thing I haven't tried is clean all, install stock, root, install custom rom, and download again everything, maybe the bug is caused by something on that last cwm backup
I'll let you know as soon as I upload my bakcup
cheers

Well thank you! How i have this issue from one year i learned to live with her, but i could not live without root. So if i will instal a stock rom without root i will be unable to correct the usb connection i will get stuck with stock rom and no root. Will be the end of my phone. In am interesed to gain the usb connection for change the bb, i supose i can be something wrong with my bb 1035.21_20110725 and gingerbread. You can check to change the bb to see if you get again losing usb connection. Cheers and thank you 4 all.

got this after CM10 install
I've only had my phone for 1 day from new and already got this problem.
Rooted with superoneclick
Installed CWM v5.x
Installed CM10 Nightly Nov 13th
Now no USB mode, only charging.
baseband: v10e
RIL: CM10 1106
EDIT UPDATE: Well its working for me again now, I think in my case it was because I was using Linux and CM10.
By going to Settings/Storage then pressing menu button and selecting 'USB computer connection' I was able to change the 'Connect as' option from MTP to Mass storage and it now works.

@tiktok1 Lucky you!!!
@ocr66 Any news about this bug???

vladutz9 said:
@tiktok1 Lucky you!!!
@ocr66 Any news about this bug???
Click to expand...
Click to collapse
Actually yes, I've managed to identify what's triggering the bug at least in my phone, so might be the same for others as well, see the second post
BTW, did you tried already the fix? did you used my stock froyo backup?, if it didn't work, I can make another and upload it

Hi. Looks like I have the same problem with USB as you. Your theory about the wall charger might be correct. Here's my situation:
So, I've got my phone two days ago, bought used, came with a general Sony Ericsson USB charger. It says it outs 850mA at 5.0V (confirmed with a multimeter). The phone is on stock Android 2.2.2, isn't rooted yet. The guy from who I got the phone says that he suffered too with this kind of problem, however he got it working after 2 weeks without the use of the hidden menu. This means, that in those 2 weeks, he might have used a PC or a laptop to charge the phone. I tried the hidden menu port settings, however the only "working" mode is AP UART, but it is not recognizable by the PC, even if I try to link the LG drivers manually. Cycling through the modes did not help. I'll try to charge the phone with my PC, and see if that dose anything.
Details of the phone:
Firmware version: 2.2.2
Baseband: 1035.21_20110218
Kernel: 2.6.32.9-dirty
Build: FRG83G
LGE Version: LGEP990-V10b

Wow. All i can say is wow! Gosh! Just dunno how grateful I am stumbling upon this thread! Kudos to you sir,you just ended my 2 month long frustration about my phone not being able to communicate to my PC. was getting ready to send the phone for service then I read this. I had flashed every GB ROM imaginable from the dev thread with no luck. I am running carburano DM 1.7 now,all I did was to go to the hidden menu,switched one port setting,wait,then voila! PC recognized my phone! Again thanks,great respect to you,and Superskill.

Hi, this is my post to thebgeneral board by accident, didnt even read there was a qanda section lol
It didn't work on my gfs phone unfortunately, notvsure what was wrong.
Maybe I should try stock Rom instead of modded, how long are you guys waiting for the phone to show up?
I downloaded a stock Rom that had been modded.
So I could be sure that I would have cwm in case anything went wrong.
Rom loaded and was able to get into the secret menu.
I will say that under USB connection type there was misspelling where it said:
LG USB adnroid
Not sure if that would affect it.
I selected that item.
Then went to port.
Selected the different options in ordered and waited about 10 seconds on each turn, then pressed find any changes in device manager unplugged and plugged the USB.
Then tried in different orders but with not luck.
Took the battery out and tried holing the vol up down the plugging in USB but to no avail.
Then pressed power and vol down.
The phone tuned on and showed LG sign then switched off.
I tried pressing check any changes as the LG sign came on but nothing.
Then tried nvflash as the LG sign came on but nvflash showed no connection.
Very weird, definitely dead but still charges, doesn't make sense.
Oh well
Ordered an atrix with work and play kit for 68 quid, has a broken digitizer which will cost 20 pound, on average, off ebay.
Thanks for the help though.
May take the 2x apart when new phone comes and see if there's any physical damage on te board.
Sent from my LG-P990 using xda app-developers app
Sent from my LG-P990 using xda app-developers app

mondc1088 said:
Wow. All i can say is wow! Gosh! Just dunno how grateful I am stumbling upon this thread! Kudos to you sir,you just ended my 2 month long frustration about my phone not being able to communicate to my PC. was getting ready to send the phone for service then I read this. I had flashed every GB ROM imaginable from the dev thread with no luck. I am running carburano DM 1.7 now,all I did was to go to the hidden menu,switched one port setting,wait,then voila! PC recognized my phone! Again thanks,great respect to you,and Superskill.
Click to expand...
Click to collapse
Lucky you! I was to in DM 1.7 but when i was in hidden menu i chosing another port, don´t want to save the settings. Anyway congrats!

No luck...
I've used my PC for charging for a week now, still no USB connectivity. I think this might be a hardware issue with me as the phone sometimes says it's charging, but it's actually in my hands with no cable attached. I managed to root the stock 2.2.2 firmware with GingerBreak and installed CM7 with RomManager with a downloaded ZIP on the SD card. Thanks for the tips anyways.

Doctor0710 said:
I've used my PC for charging for a week now, still no USB connectivity. I think this might be a hardware issue with me as the phone sometimes says it's charging, but it's actually in my hands with no cable attached. I managed to root the stock 2.2.2 firmware with GingerBreak and installed CM7 with RomManager with a downloaded ZIP on the SD card. Thanks for the tips anyways.
Click to expand...
Click to collapse
Hello, I'm sorry it took me a while to answer, I've been busy with my finals, did you tired the tutorial I posted? the hidden menu modification? I know that you let your phone charging for a while with your pc, actually, it should've worked but, maybe the problem on your phone actually is something else, 'cuz I haven't had that issue that the phone says it is charging but its not connected to the charger, my brother told me that he have had that same issue but with other phone, he changed the wall charger and that "fixed" it, but I think if you haven't tried the tutorial, give it a shot, try changing to CP UART if your phone's usb is working as it should, your computer should detect a new unknown device, if not, myabe your phone is hardware damaged, hope you can fix your phone soon
cheers

monkeyass said:
Hi, this is my post to thebgeneral board by accident, didnt even read there was a qanda section lol
It didn't work on my gfs phone unfortunately, notvsure what was wrong.
Maybe I should try stock Rom instead of modded, how long are you guys waiting for the phone to show up?
I downloaded a stock Rom that had been modded.
So I could be sure that I would have cwm in case anything went wrong.
Rom loaded and was able to get into the secret menu.
I will say that under USB connection type there was misspelling where it said:
LG USB adnroid
Not sure if that would affect it.
I selected that item.
Then went to port.
Selected the different options in ordered and waited about 10 seconds on each turn, then pressed find any changes in device manager unplugged and plugged the USB.
Then tried in different orders but with not luck.
Took the battery out and tried holing the vol up down the plugging in USB but to no avail.
Then pressed power and vol down.
The phone tuned on and showed LG sign then switched off.
I tried pressing check any changes as the LG sign came on but nothing.
Then tried nvflash as the LG sign came on but nvflash showed no connection.
Very weird, definitely dead but still charges, doesn't make sense.
Oh well
Ordered an atrix with work and play kit for 68 quid, has a broken digitizer which will cost 20 pound, on average, off ebay.
Thanks for the help though.
May take the 2x apart when new phone comes and see if there's any physical damage on te board.
Sent from my LG-P990 using xda app-developers app
Sent from my LG-P990 using xda app-developers app
Click to expand...
Click to collapse
What I did on my phone is exactly what I posted, if your computer haven't detected your phone on CP UART I doubt rebooting will make a change, anyways the most important thing to see if your usb is damaged or not is to try on the hidden menu the option CP UART it almost instantly detect the device, but, not everytime, I once waited there 20 min, so, give it a shot if you want, the stock rom I posted (on second post) is Mexico's Telcel stock rom, rooted, it doesn't delete your cwm recovery nor root, you can give it a try if you want, but read the instructions 'cuz you have to restore the ext3 format of your phone's partition to make it work (it stays on boot loop if you don't restore ext3 format), if the backup doesn't work, let me know to upload a new backup, hope you can fix it
cheers

vladutz9 said:
Lucky you! I was to in DM 1.7 but when i was in hidden menu i chosing another port, don´t want to save the settings. Anyway congrats!
Click to expand...
Click to collapse
Hey did you managed to fix the problem yet? did you tried the bakcup I uploaded? it's Mexico's telcel stock rom, rooted, its made by cwm so it doens't delete your cwm recovery, give it a try if the backup doesn't work, let me know to make a new one and upload it ok?
cheers