Database Develop

T-mobile G1 problem

I just bought a HTC G1 from an ebay user from USA.(I'm from Romania)
I did a hard reset on the phone and now when I put a sim I need to enter the unlock code and can`t turn wireless on if I chose not to enter the unlock code.
Are there any option on how to unlock the phone without the code, or to get past the 'fresh start' screen?

Two things you can do:
1st, contact the user back that sold you the G1. Ask them to obtain the unlock code from T-Mobile (USA) to send to you.
2nd, you can obtain the unlock code yourself by purchasing the unlock code from one of the site.
There are no option to unlock the phone without the unlock code. (as far as I know)

And what about the activation screen? how can i get past it?

Once you get the unlock code and put it in. You can activate your google account with your data plan. You might have to setup your APN setting thou.
Another thing you might or have to do is downgrade and root your phone. Then flash the custom ROM of your choice.

Done unlocking & activating, now it keeps restarting, what can I do? Also the battery lasts 1 day max
// also the screen remains black when I try to unlock (sometimes)

tachemario said:
Done unlocking & activating, now it keeps restarting, what can I do? Also the battery lasts 1 day max
// also the screen remains black when I try to unlock (sometimes)
Click to expand...
Click to collapse
First you want to find out if you are still on stock or you have a custom ROM on your G1.
If you have stock, then you have to root your G1 first.
If you phone has a custom ROM then you G1 has already been rooted. You can load other ROM that you want.

I tried to update to 1.6 but it says error line 1 etc. all the time.
Please help
I`m on stock & when I try to root it says to force close app

Also, i`m running android 1.5 & marketplace is beta & I can`t see all the stuff

Ohh! Boy here we go. You'll need to downgrade to RC29 (since your G1 is from US). Don't worry about the unlock. Once unlocked it stay unlock.
First you want to get ADB setup on your PC and have it setup with your G1.
http://forum.xda-developers.com/showthread.php?t=532719
Once you have that going then you can start with the downgrading to RC29. After you have downgraded, you will have to go through the activation screen again.
Once the activation screen is done, then you can do the rooting process.
http://theunlockr.com/2010/04/26/how-to-root-the-htc-g1dream/
After you have rooted, then you can flash the custom ROM.

Done, the phone is rooted but now I have some other issues with it.
First, my earpiece dosen`t work
Second, my screen sometimes dosen`t come 'back to life' when I try to unlock it
http://www.youtube.com/watch?v=0qk3FIs3Q-s&feature=related
this problem

Can anyone help me?

Well, I screwed up trying to root. And I'm willing to pay someone to help me fix it.

After a series of poorly judged flashes and (eventually) factory resets in the name of acquiring root, I am left with a stock S6 that gets no service whatsoever. Knox is tripped. The phone shows 5 bars but will not connect to 4G, GSM, CDMA, nor will it send/receive anything unless it's connected to Wifi and uses wifi calling.
I've been trying to fix this since 11pm last night and I am extremely frustrated. I would love to pay someone who has a clear understanding of these things to hold my hand through getting this thing working again. I have passed the point where my skills can help me.

Hi do you have facebook
Sent from my SM-G800H using Tapatalk

Have you put in your phone companies apn settings ?

Have you tried to Odin back to stock? It sounds like you flashed a custom recovery; what exactly did you do?

Yes, the APN settings are correct. I entered them manually in a second profile, but they were prepopulated as well. Neither makes a difference. I get "Not registered on network" when I try to make a call. When I try to have the phone detect TMobile's network, it says "Unable to select network. Select automatically".
The big issue is, I'm fairly certain the first thing I flashed was not meant for this phone...smh. I was able to Odin back to stock. Before and after multiple factory resets and cache wipes (though no settting for Dalvik cache in recovery...does this mean anything?) everything works fine except I have no service.

Try and toggle Airplane mode on and off? Also if you were on Wifi with Wifi calling disable both of those for the time being. Last case would be to odin factory firmware.

yes, i've tried that. i've tried removing the sim card for a few minutes to no avail.
with wifi and wifi calling on, the phone functions as normal but as soon as that's off, everything stops working.

I don't trust Odin to wipe everything it should.
Download a rooted stock rom. Then go into recovery, mount /system and wipe /system, cache & data, then flash the rom. Finish the setup wizard and try to make a call without wifi. If you cannot, verify APN is correct.
You could have a bad sim card. Sim cards die just like any other piece of electronics. Go to T-Mobile and swap sim cards, they should do it for free.
Edit: I just realized you are probably still on stock recovery. Root your system, flash twrp, then nuke the phone in recovery and start from scratch.
I assume you already tried restoring a nandroid. If that doesn't work and you can't make calls after restoring via Odin or flashing another rom, then you may have corrupted the EFS partition. The only way to recover from that is if you backed up your original EFS partition. A lot of people don't bother, but it is a critical step before flashing your first mod.

..

thank you so much for the advice. i'm trying this now.

OMGitsAlize said:
Have you put in your phone companies apn settings ?
Click to expand...
Click to collapse
socal87 said:
Have you tried to Odin back to stock? It sounds like you flashed a custom recovery; what exactly did you do?
Click to expand...
Click to collapse
Saafir said:
Wouldn't hurt to give Update Profile a go under System Update too.
Click to expand...
Click to collapse
this option does not exist for me

sublimaze said:
I don't trust Odin to wipe everything it should.
Download a rooted stock rom. Then go into recovery, mount /system and wipe /system, cache & data, then flash the rom. Finish the setup wizard and try to make a call without wifi. If you cannot, verify APN is correct.
You could have a bad sim card. Sim cards die just like any other piece of electronics. Go to T-Mobile and swap sim cards, they should do it for free.
Edit: I just realized you are probably still on stock recovery. Root your system, flash twrp, then nuke the phone in recovery and start from scratch.
I assume you already tried restoring a nandroid. If that doesn't work and you can't make calls after restoring via Odin or flashing another rom, then you may have corrupted the EFS partition. The only way to recover from that is if you backed up your original EFS partition. A lot of people don't bother, but it is a critical step before flashing your first mod.
Click to expand...
Click to collapse
okay, i do think it's possible that i corrupted the EFS partition. however, in download mode, the IMEI number it displays is correct.
i am able to get the phone rooted and twrp installed, but once i try to flash the rooted stock rom, i get a "error executing updater binary in zip". not sure how to proceed.
i may abandon the phone altogether and just order an insurance replacement :-/

postmastergeneral said:
okay, i do think it's possible that i corrupted the EFS partition. however, in download mode, the IMEI number it displays is correct.
i am able to get the phone rooted and twrp installed, but once i try to flash the rooted stock rom, i get a "error executing updater binary in zip". not sure how to proceed.
i may abandon the phone altogether and just order an insurance replacement :-/
Click to expand...
Click to collapse
With knox tripped gooood luck. Also, did u have an EFS backup?

That error message means the rom zip is looking for a different device code than the one you are trying to flash it on. Where did you get the rom file? Are you sure it is correct for your S6?

dial *#0011# and post a screenshot for me. I can help you.

Sunderwear said:
dial *#0011# and post a screenshot for me. I can help you.
Click to expand...
Click to collapse
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
THANK YOU

Pm. I'll help you

Any resolution? I am curious to know what exactly happened and what fixed it.

sorry for not PMing you. i got frustrated and stubborn and just ordered a new phone.

postmastergeneral said:
sorry for not PMing you. i got frustrated and stubborn and just ordered a new phone.
Click to expand...
Click to collapse
I feel bad for you - but very curious about one thing - I thought I read the thread carefully and never noticed a response to the question - "Did you try to odin back to Stock?"
Samsung phones are amazingly resilient - and under most conditions (unless you the phone is really totally FUBARed ) odining back to stock cures 99% of all problems - at least that I have seen. And except in one instance with the NOTE 3 (after it's initial release) Odining the stock rom usually fixes the problem every time. The note three was an unusual circumstance in my memory - and it happend to a bunch of people - I actually screwed up two phones and returned them both to get replacements - Odin would not fix the problem because one of the particians or maybe all of them had been corrupted) but you had an IMEI where I did not - so I don't think that was your issue (although, I may be wrong)
anyway, I can understand your frustration - I have been there my self - but usually cooler heads (the people at XDA) have helped me to find the solution that eventually worked - did you try to ODIN back to Stock? If that did not work then returning the phone may have been your only option - but I would love to know if you did try that option?

Phone had issues with crashing, and now won't even launch

Maybe you guys could help me. I'm at a loss and customer support told me to turn it off and turn it back on. I bought the Razer Phone 2 on December 27th. Around mid to late February, I had an instance where the phone crashed and was black screen, but the vibration reacted to me touching/pressing the power button. Hard resetting the phone allowed it to go back to normal. It got more frequently and more annoying, and it got to the point where multiple resets wouldn't fix it. Several times I got a screen telling me it couldn't load the android system(First image). After several instances of that screen, I tried to wipe the phone and reset it to factory, and now it's just an expensive paperweight. I can press Power+Volume Up to get to android recovery, but choosing to start up does nothing, reboot to bootloader does nothing, and pretty much everything else is useless.
Like I said, I contacted customer support, and their response was to tell me to wipe the phone and try again, which does nothing. After I said it didn't work, they said that was the best they could come up with, and that I would have to send it in and pay the costs as it was out of warranty, even though it's not even 6 months old. I tried finding a fix for it on google, and saw someone posted a similar issue, but it was fixed by power+vol up and that was the end of it, so not as far as my issue is currently. I've come to you guys as a last ditch effort to see if I could fix it before having to spend even more money to this company. This is the second phone I've got from them and both have had issues. Hoping someone saves me...
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}

Have you unlocked your bootloader? Rooted? I'm having similar issues and I'm completely stock, I have not unlocked my bootloader or rooted or anything. If my screen goes off it won't come back but I get vibration when I press power button and I have to reset with volume up and power.

Bloodeagle said:
Maybe you guys could help me. I'm at a loss and customer support told me to turn it off and turn it back on. I bought the Razer Phone 2 on December 27th. Around mid to late February, I had an instance where the phone crashed and was black screen, but the vibration reacted to me touching/pressing the power button. Hard resetting the phone allowed it to go back to normal. It got more frequently and more annoying, and it got to the point where multiple resets wouldn't fix it. Several times I got a screen telling me it couldn't load the android system(First image). After several instances of that screen, I tried to wipe the phone and reset it to factory, and now it's just an expensive paperweight. I can press Power+Volume Up to get to android recovery, but choosing to start up does nothing, reboot to bootloader does nothing, and pretty much everything else is useless. ...Hoping someone saves me...
Click to expand...
Click to collapse
My phone does this every once in a while. I believe it's something wrong with the second pie update and without having an unlocked bootloader this isn't something that a lot can be done about.
You have access to the recovery at least, and that's good if you can find someone willing to share the update payload zip then you might be able to apply the update again over ADB. Doing so might restore your phone to working-enough condition to fully flash a factory image just be sure there's nothing corrupt in the bootstack or system image. My suggestion would be to ask around and see if anyone is willing to revert to an older version of the firmware to grab the update payload(or has one archived) so that you can try this method. It might be your best shot.
If all of that doesn't pan out, then you might be SOL unless you can wipe it over ADB/Fastboot while in the recovery or bootloader. There's a slight possibility that the phone isn't properly resetting when you do it through the recovery menu but is just deleting personal data without defaulting the configs or checking for errors. There might even be a chance that you can configure it to boot from slot B through fastboot. I'm not sure how to do that one but as far as I'm aware, when you apply updates it moves the old data to slot B so it can put fresh images in slot A(someone correct me if I'm wrong).
natefck420 said:
Have you unlocked your bootloader? Rooted? I'm having similar issues and I'm completely stock, I have not unlocked my bootloader or rooted or anything. If my screen goes off it won't come back but I get vibration when I press power button and I have to reset with volume up and power.
Click to expand...
Click to collapse
Before your issue gets to the point where your phone doesn't boot correctly like OPs, you should follow the tutorial on Razer's Dev site to unlock your bootloader so if something does happen or the issue persists, you can flash the stock firmware onto your phone with minimal issue. If you end up unlocking, DO NOT relock the bootloader. Nothing bad actually happens if you do unless you've got a custom ROM or kernel installed, then you will probably brick. I wouldn't know since I'm not willing to try relocking with non-factory images...
It's just that having the bootloader unlocked is required to flash the images from Razer so if you're having the black screen bug then you really should unlock for safety. Naturally, if you're still in warranty then try to get it fixed through Razer. This is a more "If all else fails" or " Just in case" kind of a solution for people who like fixing their own stuff or are out of warranty. Also, unlocking your bootloader gives you the ability to install Arter97's kernel and TWRP which can improve your phones stability and reduce the need to restart from the screen off bug. TWRP backups are a huge bonus, too.

Razer is not suitable for mobile phones, this phone is all bug?

General [CLOSED] --

USE UPDATED POST, HERE!
THIS POST IS NOW ONLY REFERENCE ONLY - WILL BE DELETED SOON.
Well I figured I'd make a quick How-To on how I successfully Carrier/Sim unlocked my Samsung Galaxy S21 Ultra 5G running the NEWEST Android update on bootloader 5 (USQU5BULJ)released in January of 2022.
***This does NOT trip Know and does NOT require a root or a paid service. ***
****Also Note - This is the process I took, you may find some of these steps are not needed but for the purpose or recreating my results, I'll be posting my exact process.
****This has ONLY BEEN TESTED ON SNAPDRAGON BASED SAMSUNG GALAXY S21 ULTRA 5G SM-G998 U & U1, if you try it on a different model or phone you may (and likely will) receive different results!!!!
Here's what you'll need:
•ANY (activated or not) Sim from the carrier you wish to switch too.(or a way to replicate the carriers cert from one)
•A computer
•Patched Odin
•BOTH the NEWEST U & U1 ROMs/Firmware - theres a full post on these and how to flash them here on XDA (Reminder for myself or mod to link it) or visit SamFW.com, it has both Odin and the ROM/Firmware files you will need.
•Android ADB platform tools (You can find them on the official Android Developers page here or use any ADB software of your choice, fastboot is not required or used in this process.(Google "Android Developer Platform Tools" to get them from the official Android devs page. )
STEP 1:
So let's presume you have a Verizon or T-Mobile carrier locked phone, if you look at your baseband, which you can find in Settings > About > Software Info, you should see this "SM-G998Uxxxxxxx"
*****IF YOU SEE "SM-G998U1xxxxxxx" STOP - Skip to step 2******
Head over to your preferred site to get stock Samsung Roms (Refer to link above if you don't know where to find) and download the U1 XAA rom and the U rom of the CARRIER YOU WISH TO USE. IMPORTANT! MAKE SURE YOU DOWNLOAD THE "U" ROM FOR BOTH THE CARRIER YOU WISH TO SWITCH TO AND THE U1 UNLOCKED ROM.
Put you device in download mode (Hold Vol up and Vol down and plug in the USB, which should be connected to your PC and now your phone at this point.)
Flash the U1 XAA Rom, place appropriate files in appropriate places in Odin, when you get to CSC, DO NOT use the "HOME_CSC" use the other.
Leave the rest of Odin settings alone and hit Start, wait for it to finish and reboot.
Step 2:
Once the phone boots, return to Settings>About>Software and confirm you are using the XAA rom by looking at Service Provider Software Version and it should say something like "SM-G998U1_XAA blah blah blah" you just want to see the U1 and XAA.
Now put in the Sim from the carrier you desire. A pop-up should appear prompting you to restart your device. Follow the prompt.
!MOST IMPORTANT STEP!
BEFORE the device fully restarts, force it into RECOVERY MODE, I was able to achieve this by holding the power and Vol Down buttons at the same time, starting to hold the directly after the "Samsung" Logo fades away upon initial restart. If you have trouble getting into recovery please comment below.
Once in recovery, use the volume keys to navigate to "Clear Cache" select and execute. Now go to Factory Data Reset/Wipe, select and execute. It should be the option directly above "Clear cache".
Once done, go up to "Reboot to Bootloader", Select, Execute.
AGAIN, Very Important step,you MUST interrupt the boot process again and force the phone BACK into download mode this time, so once the phone attempts to reboot, you need to hold the Vol Down and Vol Up buttons at the same time and the USB MUST be already plugged in.
We should now be back in download mode and be on the U1 rom. We have verified all of this in the steps above.
STEP 3:
Now it's time to flash the ROM from the carrier you wish to use. Make SURE you have a Sim from that carrier inserted during this process. It doesn't need to be a working or activated Sim, just simply one from the carrier you wish to have your S21 work on.
Flash all items as you did earlier, but using the "U" ROM for your desired carrier as described above. Same deal with CSC, DO NOT use the "Home_CSC"
BE SURE that you use the USERDATA file if there is one for your carrier. Very important to have the phone working properly.
Start the Odin flashing process.
Phone will Auto-Reboot.
Done!
You should now be on the carrier you wish to use. This can be (in theory, test at own risk) replicated for ANY carrier supported by Samsung, and, I should soon find out if it will lead to what my original goal was, a bootloader unlock on the QualComm SnapDragon variant of the S21 and future Galaxy devices.
If you have any issues please comment below.
PoC, results after doing above process.
Good luck.
-k0mrade
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}

There are some parts of my tutorial that are not well expressed and may be misleading. Please don't hesitate to post in comments if you need clarity.

IMPORTANT!!! I LEFT OUT ONE MAJOR STEP! ************ ----- BETWEEN STEP ONE AND STEP 2 - After you do the factory data reset/Wipe cache -> reboot to Bootloader -> force into download, you need to flash the U1 rom BEFORE putting in your desirced carriers SIM, then reboot, let phone fully boot, THEN insert your desired carriers SIM -> restart phone-> interrupt boot by forcing into recovery and repeat factory data wipe and cache wipe and reboot bootloader -> interrupt Boot Process again, but into Download Mode -> Flash your desired "U" carrier Firmware (must be same carrier as the SIM you put in as described above). -> Done.

And when/where does one need to use the required ADB-Tools?

tested and work only on S21 ULTRA 5G SM-G998 U & U1
thank you

OnnoJ said:
And when/where does one need to use the required ADB-Tools?
Click to expand...
Click to collapse
Lol this is likely one of those steps thats unneeded. i cant remeber off the top of my head why exactly i added that in. But it wont hurt to have the drivers, thats for sure.

Ive made a (Slightly) more clear post, hopefully better detailing this, Here. Mods may close this thread as they feel free but i will leave it up as a resource for the time being.

How many different devices have you tested this on?

iBowToAndroid said:
How many different devices have you tested this on?
Click to expand...
Click to collapse
ive just finished doing it on my 6th one device, 4 were Verizon 1 was Tmobile and 1 was ATT. I seem to be able to replicate this process over and over again so far with no issues so far, but i am making sure to update each device manually via odin 1st to latest u1 Firmware first as described above.

K0mraid3 said:
ive just finished doing it on my 6th one device, 4 were Verizon 1 was Tmobile and 1 was ATT. I seem to be able to replicate this process over and over again so far with no issues so far, but i am making sure to update each device manually via odin 1st to latest u1 Firmware first as described above.
Click to expand...
Click to collapse
And for each device, did you personally verify that it was not already unlocked before starting?
Because normally you can't get that restart popup prompt on U1 firmware unless the device is already unlocked

iBowToAndroid said:
And for each device, did you personally verify that it was not already unlocked before starting?
Because normally you can't get that restart popup prompt on U1 firmware unless the device is already unlocked
Click to expand...
Click to collapse
thats essentially the point of going from u to u1 then back to u after you booted atleast once into u1 with the desired carriers sim, somewhere along in the process of interrupting the bootloader and flashing the carriers U Firmware its overwriting the system policy. Theres a hole in here somewhere im positive. still trying to pin point exactly where this weakness lies.

iBowToAndroid said:
And for each device, did you personally verify that it was not already unlocked before starting?
Because normally you can't get that restart popup prompt on U1 firmware unless the device is already unlocked
Click to expand...
Click to collapse
End Game is to find a BL exploit to force enable OEM Unlocking on these qcomm s21s.

K0mraid3 said:
End Game is to find a BL exploit to force enable OEM Unlocking on these qcomm s21s.
Click to expand...
Click to collapse
You're definitely not going to find that, as that's not related to SIM unlocking whatsoever

iBowToAndroid said:
And for each device, did you personally verify that it was not already unlocked before starting?
Because normally you can't get that restart popup prompt on U1 firmware unless the device is already unlocked
Click to expand...
Click to collapse
And sorry to answer your initial question, yes, verfied carrier lock, getting errors like this, see attached.

iBowToAndroid said:
You're definitely not going to find that, as that's not related to SIM unlocking whatsoever
Click to expand...
Click to collapse
I like a challenge

This "temporary" thread is now closed. Main thread is here.

How To Guide Carrier/SIM Unlock - Galaxy S21 Ultra 5G SM-G998U & U1 (QualComm SnapDragon) USA/CANADA! - NO ROOT- FREE

Here's a free How-To on how i successfully Carrier/Sim unlocked my Samsung Galaxy S21 Ultra 5G running the NEWEST Android update on bootloader 5 (USQU5BULJ)released in January of 2022 that was carrier locked to Verizon and now fully Unlocked.
DISCLAIMER:
*This does NOT trip Knox or Void your warranty and does NOT require a root or a paid service. **This is the process I took, you may find some of these steps are not needed but for the purpose or recreating my results, I'll be posting my exact process.***This has ONLY BEEN TESTED ON SNAPDRAGON BASED SAMSUNG GALAXY S21 ULTRA 5G SM-G998 U & U1, if you try it on a different model or phone you may (and likely will) receive different results!!!!
You can read more on how this method works to force a carrier update to your device, here, on the Official Android dev site.
Here's what you'll need:
•ANY (activated or not) Sim from the carrier you wish to switch too.(or a way to replicate the carriers cert from one)
•A computer
•Patched Odin
•BOTH the NEWEST U & U1 ROMs/Firmware - theres a full post on these and how to flash them here, Stock Firmware and ODIN Flashing Guide (XDA) or visit SamFW.com, it has both Odin and the ROM/Firmware files you will need.
•(Optional?) Android ADB platform tools (You can find them on the official Android Developers page here or use any ADB software of your choice, fastboot is not required or used in this process. Link: Android Dev Platform Tools (Official)
Step 1:
So let's presume you have a Verizon or T-Mobile carrier locked phone, if you look at your baseband, which you can find in Settings > About > Software Info, you should see this "SM-G998Uxxxxxxx"
NOTE:
It Is CRITICAL that we flash the U1 rom BEFORE putting in the desired carriers SIM, then reboot, let phone fully boot, ONLY THEN should we insert the desired carriers SIM.
Step 1b:
Head over to your preferred site to get stock Samsung Roms (Refer to link above if you don't know where to find) and download the U1 XAA rom and the U rom of the CARRIER YOU WISH TO USE.
IMPORTANT! MAKE SURE YOU DOWNLOAD BOTH THE "U" ROM FOR THE CARRIER YOU WISH TO SWITCH TO AND THE U1 UNLOCKED (XAA) ROM/Firmware.
IF YOU ALREADY HAVE U1 FIRMWARE
I.e "SM-G998U1xxxxxxx" - you can skip to step 2, but I would recommend reading through the next part.
Put you device in download mode (Hold Vol up and Vol down and plug in the USB, which should be connected to your PC and now your phone at this point.)
Flash the U1 XAA Rom, place appropriate files in appropriate places in Odin, when you get to CSC, DO NOT use the "HOME_CSC" use the other.
Leave the rest of Odin settings alone and hit Start, wait for it to finish and reboot.
Step 2:
Once the phone boots, return to Settings>About>Software and confirm the device is now showing the "U1_XAA" in the Service Provider Software Version - it should say something like "SM-G998U1_XAA blah blah blah" - you just want to see the "U1" bit.
Now put in the Sim from the carrier you desire. A pop-up should appear prompting you to restart your device.
! CRITICALLY IMPORTANT STEP !
We will now initiate a reboot, but BEFORE the device fully restarts, we need to force it into RECOVERY MODE, I was able to achieve this by holding the power and Vol Down buttons at the same time, starting to hold them directly after the "Samsung" Logo fades away upon initial restart. If you have trouble getting into recovery, please comment below.
Once in recovery, use the volume keys to navigate to "Clear Cache" select and execute. Now go to Factory Data Reset/Wipe, select and execute. It should be the option directly above "Clear cache".
Once done, go up to "Reboot to Bootloader", Select & Execute.
AGAIN, Very Important step! We MUST interrupt the boot process again and force the phone BACK into download mode this time, so once the phone attempts to reboot, we need to hold the Vol Down and Vol Up buttons at the same time and the USB MUST be already plugged in, essentially it should remain plugged in throughout this process.
We should now be back in download mode and be on "U1" as we have verified in the steps above.
STEP 3:
Now it's time to flash the ROM/Firmware from the carrier you wish to use. Make SURE you have the SIM from the same carrier inserted during this process as mentioned at the beginning. It doesn't need to be a working or activated SIM, just simply one from the carrier you wish to have this S21 work on.
Flash all items from the "U" ROM/Firmware as you did earlier, ensuring to use the "U" ROM/Firmware for your desired carrier as described above. Same deal with CSC here, DO NOT use the "Home_CSC", use the other.
BE SURE that you use the USERDATA file that comes with the "U" ROM/Firmware. Its Critical in order to get the phone working properly on the new carrier.
Start the Odin flashing process & wait.
Phone will Auto-Reboot.....
Done!
You should now be on the carrier you wish to use.
This can be (in theory, test at own risk) replicated for ANY carrier supported by Samsung.
Please comment your experiences/ issues etc below. Don't be afraid to ask for clarity of something.
PoC, results after doing above process pictured in this screenshot.
Good luck.
-k0mrade
Send me Crypto if I helped?
Before process, this message would appear shortly after inserting a new SIM in testing devices:
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
After preforming above procedures I now find pictured below by running this activity:
com.samsung.ssu.unlock.MainActivity
And verify twice by checking my work in Settings>About>Software Information> Service Provider Software Version & Carrier Configuration Version.
For anyone whos still having trouble, try following the directions on this thread. Maybe they explain it a bit better or their process omits/includes parts ive missed.
Alternative Guide To Carrier Unlocking S21
Good Luck.

-

Have you attempted this on lower bootloader revisions?

iBowToAndroid said:
Have you attempted this on lower bootloader revisions?
Click to expand...
Click to collapse
I have not. But am very interested to see how it goes if you or anyone decides to give it a shot, it SHOULD work on any BL considering the method of attack. But I can't verify it does.

Hello. I did everything as in the guide. I downloaded U1 firmware for XAA, but for some reason CCT remains on the phone. Also in the step where to insert the Sim, my phone does not ask me to reboot the device.

xDpakaX said:
Hello. I did everything as in the guide. I downloaded U1 firmware for XAA, but for some reason XAS remains on the phone. Also in the step where to insert the Sim, my phone does not ask me to reboot the device.
Click to expand...
Click to collapse
Have you tried doing a normal reboot and forcing into recovery first, wipe cache, factory reset, reboot to Bootloader, then before full boot force into download mode with your SIM from the carrier you want to go to already inserted and downloading the "U" Firmware for the carrier you want and flashing it? What does Odin and/or your Baseband in settings say after doing above e process?

Thanks for the guide! Is there any chance this process might also work on other phones? I have a Samsung Galaxy XCover Pro that I've been trying to unlock for months. I've called Verizon many times, and they claim they already unlocked it, but when I put another sim in I still get the message "Sorry, your device can't be activated on another carrier's network right now. For help, contact Verizon at (800) 922-0204 or (888) 294-6804 (prepaid plans)."

Proverbs2 said:
Thanks for the guide! Is there any chance this process might also work on other phones? I have a Samsung Galaxy XCover Pro that I've been trying to unlock for months. I've called Verizon many times, and they claim they already unlocked it, but when I put another sim in I still get the message "Sorry, your device can't be activated on another carrier's network right now. For help, contact Verizon at (800) 922-0204 or (888) 294-6804 (prepaid plans)."
Click to expand...
Click to collapse
What's the Baseband Version?

iBowToAndroid said:
What's the Baseband Version?
Click to expand...
Click to collapse

@Proverbs2 it can be done with a computer, but not with the method listed above. It would have to be done by a professional business that offers SIM unlocking, so it wouldn't be free. If you want to have it done, don't do any more software updates until after it's unlocked

iBowToAndroid said:
@Proverbs2 it can be done with a computer, but not with the method listed above. It would have to be done by a professional business that offers SIM unlocking, so it wouldn't be free. If you want to have it done, don't do any more software updates until after it's unlocked
Click to expand...
Click to collapse
Thanks! I tried paying a service to unlock it already, but they were unable to unlock it and refunded my money. I unlocked the bootloader and rooted the phone before getting the sim unlocked, unfortunately, so none of the usual methods seem to work.

Proverbs2 said:
Thanks! I tried paying a service to unlock it already, but they were unable to unlock it and refunded my money. I unlocked the bootloader and rooted the phone before getting the sim unlocked, unfortunately, so none of the usual methods seem to work.
Click to expand...
Click to collapse
Yep then you're screwed. It can't done if Knox is tripped

Proverbs2 said:
Thanks for the guide! Is there any chance this process might also work on other phones? I have a Samsung Galaxy XCover Pro that I've been trying to unlock for months. I've called Verizon many times, and they claim they already unlocked it, but when I put another sim in I still get the message "Sorry, your device can't be activated on another carrier's network right now. For help, contact Verizon at (800) 922-0204 or (888) 294-6804 (prepaid plans)."
Click to expand...
Click to collapse
Hmm I have not tried it, but, in all reality, I used this exact same method YEARS ago on my S7 Edge and it worked then. I have not tried it on another Samsung but I'd imagine anything other then the newest flagship would probably be quite simple to fix as there should already plenty of resources available via Github and such. If you take it on let me know, I'll do what I can to help.
If you want to test it out on your device, i see no reason why it shouldnt work if done correctly, but you may have to play with the order in which you interrupt the bootloader and force the update. Even if you have tripped Knox, there is indeed a way to completely disable Knox all together and not get locked out of the device. I did it on the S21 that I unlocked when I was mucking about on the phone. But that's an entire different tutorial and I'd need people to test it on other Samsung devices. But I'd be happy to share that too if you'd like.

Proverbs2 said:
Thanks! I tried paying a service to unlock it already, but they were unable to unlock it and refunded my money. I unlocked the bootloader and rooted the phone before getting the sim unlocked, unfortunately, so none of the usual methods seem to work.
Click to expand...
Click to collapse
Is it still unlocked and rooted? That would make life another easier. We can repair the IMEI, baseband etc. It's worth a go if the phones just a paper weight right now imo. But ultimately up to you.

K0mraid3 said:
Hmm I have not tried it, but, in all reality, I used this exact same method YEARS ago on my S7 Edge and it worked then. I have not tried it on another Samsung but I'd imagine anything other then the newest flagship would probably be quite simple to fix as there should already plenty of resources available via Github and such. If you take it on let me know, I'll do what I can to help.
If you want to test it out on your device, i see no reason why it shouldnt work if done correctly, but you may have to play with the order in which you interrupt the bootloader and force the update. Even if you have tripped Knox, there is indeed a way to completely disable Knox all together and not get locked out of the device. I did it on the S21 that I unlocked when I was mucking about on the phone. But that's an entire different tutorial and I'd need people to test it on other Samsung devices. But I'd be happy to share that too if you'd like.
Click to expand...
Click to collapse
Thank you! I'll give it a try and report how it goes.

Good luck! Worst case, look up a program called "Samsung TFT Module", just be sure to scan it for viruses and bad code if you have the ability.unless you are able to find the 2022 update of it, you'll have to settle for whatever version is available. It'll likely be old, clunky and out-of-date, half the program defunct, but a few key parts still work, and quite well. Don't forget ADB drivers. Let us know how it goes!
Proverbs2 said:
Thank you! I'll give it a try and report how it goes.
Click to expand...
Click to collapse

Ok, I tried to follow each step carefully, but I had to make one minor change to the procedure: after flashing the U1_XAA firmware, I had to power off the phone in order to insert the SIM card. (In the XCover Pro, the SIM card slot is obstructed by the battery, so there is no way to insert the card without powering off the phone and removing the battery.) After inserting the card, I booted directly into recovery and followed the other steps from there.
Unfortunately, it didn't work for me: the phone is still locked, showing the same message: "Sorry, your device can't be activated on another carrier's network..." Perhaps that's because I wasn't able to perform that one critical step, inserting the sim card while the phone is turned on. Any suggestions for a workaround?

K0mraid3 said:
Have you tried doing a normal reboot and forcing into recovery first, wipe cache, factory reset, reboot to Bootloader, then before full boot force into download mode with your SIM from the carrier you want to go to already inserted and downloading the "U" Firmware for the carrier you want and flashing it? What does Odin and/or your Baseband in settings say after doing above e process?
Click to expand...
Click to collapse
Yes, I followed the guide. The problem is that when I'm on U1 my phone doesn't ask me to reboot.

Hello. I did all on VZW SQU3AUDB phone. Did all steps.
I have question. But in first start after step 3 (i flash G998U VZW) i see: Sorry, your devic.... verizon message
STEP3: Now it's time to flash the ROM/Firmware from the carrier you wish to use
It min - i need to flash not VZW ROM? some other? I need to use Ukrainia operator sim. Or i need flash G998W or else?
can someone help me?

Does my bootloader need to be unlocked