Database Develop

Bootloader relock

Is there an option to lock the bootloader again after unlock?? for warranty things

8don't know but I don't think it will work cause of custom boot image.

I don't know. I have flashed the v20a (leak version) and unlock its bootloader, then rollback to official v10e, and then flash the official v20a and the bootloader is already unlocked. I think its been unlock forever maybe????

DarkFantasy6 said:
Is there an option to lock the bootloader again after unlock?? for warranty things
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Supposedly, you can flash a v10x firmware and it'll show as locked again, if I'm not mistaken. Although if they update your firmware back to a v20x, as they probably will, it will show as unlocked, and they might have a way to know when/how it was unlocked, and claim you had it unlocked before.
My advice (and personal intention) is, unless you're a developer, do not unlock the bootloader unless you're willing to risk voiding your warranty.
Although I'd be quite curious to know if they'd have the guts to invoke the unlocked bootloader for someone that goes in with stuff like dust between the screen and the Gorilla glass, or hardware failure of some sort.

DarkFantasy6 said:
Is there an option to lock the bootloader again after unlock?? for warranty things
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AFAIK when you unlocking bootloader you actually write some data to a special memory called fuse. This can be done only once. Therefore it is not possible to be locked again. But it is possible to ruin the the fuse if you do something wrong and you lose forever possibility to unlock.

Well I was on leak v20a and unlock it and flashed cwm, then i flashed Official v20a .dz with lgflashtool and bootloader got locked again. I needed to unlock it again. You can try that.
Sent from my LG-P880 using xda app-developers app

iodak said:
Well I was on leak v20a and unlock it and flashed cwm, then i flashed Official v20a .dz with lgflashtool and bootloader got locked again. I needed to unlock it again. You can try that.
Sent from my LG-P880 using xda app-developers app
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I flashed between 20a leak , official 20a and 20b, and not once i had my bootloader relock by itself

With lgflashtool or kdz? Well I dont have any proof of it becouse I didnt expected it would happen. Anyway I flashed with LGflashtool without battery and sim and with 910kohm cable.
Edit: this will clear all your data and format internal sd
Sent from my LG-P880 using xda app-developers app

iodak said:
With lgflashtool or kdz? Well I dont have any proof of it becouse I didnt expected it would happen. Anyway I flashed with LGflashtool without battery and sim and with 910kohm cable.
Edit: this will clear all your data and format internal sd
Sent from my LG-P880 using xda app-developers app
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Click to collapse
Iodak !!!???? Do you have P880 ???
Will you make kernels ?? Maybe solve the overheat problem ..
You are very very welcome here
#------------------------------------------
echo "Sender.product.model=LG-P880" # (O4X) .
if [ $thanks -eq $pressed ] ; then
thanks_meter=$((${thanks_meter} + 1)) ; fi #Press it

iodak said:
With lgflashtool or kdz? Well I dont have any proof of it becouse I didnt expected it would happen. Anyway I flashed with LGflashtool without battery and sim and with 910kohm cable.
Edit: this will clear all your data and format internal sd
Sent from my LG-P880 using xda app-developers app
Click to expand...
Click to collapse
i flashed atleast once with lgflashtool (screwed something up after deleting some bloatware + installing wrong unsecure img or something, all in all i couldnt enter S/W at all), and several times with kdz (between 20a leak and other 20x's).
and all troughout this bootloader stayed unlocked (i am on eur-xxx, so i unlocked my bootloader the day the method was found, if i recall correctly)

It may be an isolated case. You never know with LG But i am sure it was locked again, even flashed cwm thinging it stayed unlocked then gave me security error when I tried to boot recovery. So i unlock it again. Mine is also eur-xxx.
Sent from my LG-P880 using xda app-developers app

iodak said:
It may be an isolated case. You never know with LG But i am sure it was locked again, even flashed cwm thinging it stayed unlocked then gave me security error when I tried to boot recovery. Mine is also eur-xxx.
Sent from my LG-P880 using xda app-developers app
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Bootloader can't be relocked. When you flash kdz with all usual methods available for p880 you also flash secured bootloader and system recovery too. So you must flash these two again from adb every time you flash new kdz. Security error may appear if you don't flash unsecured BL before CWM.
Any way regarding warranty I don't think that LG service will bother to check bootloader state if device is bricked or something.

It can be relocked since mine was in fact relocked. It just that we need to find way. Unsecure boot.img has nothing to do with unlocking bootloader or properly running recovery. It just give you root access from adb. It is property in ramdisk in default.prop ro.secure=0. And they will sure check bootloader unlock status, they even developed Windows app for root checking.
Sent from my LG-P880 using xda app-developers app

iodak said:
It can be relocked since mine was in fact relocked. It just that we need to find way. Unsecure boot.img has nothing to do with unlocking bootloader or properly running recovery. It just give you root access from adb. It is property in ramdisk in default.prop ro.secure=0. And they will sure check bootloader unlock status, they even developed Windows app for root checking.
Sent from my LG-P880 using xda app-developers app
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I'm saying that secured bootloader won't load unsigned recovery. So maybe thats reason why you got security error. Anyway if you think unlocking is reversible maybe its best way to ask LG. Their FOSS section replied for unlocking process, maybe they answer you.

Vosetal said:
Any way regarding warranty I don't think that LG service will bother to check bootloader state if device is bricked or something.
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If the device is bricked, they'll need to find the problem before they solve it. They'll surely run diagnostics on it, and a phone diagnostic tool that doesn't diagnose something as basic as "has someone been messing with the bootloader?" isn't that good of a diagnostic tool at all..
So yeah, I'm pretty sure they'll check it. And even if I weren't, some LG support centers (the portuguese one being one of them) have mentioned that unlocking the bootloader will void your warranty, and the warranty itself mentions it (by saying any change to the provided hardware and software, which the bootloader is a part of, will void the warranty). So, at the very least, we should leave it as a warning to the community that their warranty might be voided when unlocking the bootloader and/or rooting their phone.

skryptus said:
If the device is bricked, they'll need to find the problem before they solve it. They'll surely run diagnostics on it, and a phone diagnostic tool that doesn't diagnose something as basic as "has someone been messing with the bootloader?" isn't that good of a diagnostic tool at all..
So yeah, I'm pretty sure they'll check it. And even if I weren't, some LG support centers (the portuguese one being one of them) have mentioned that unlocking the bootloader will void your warranty, and the warranty itself mentions it (by saying any change to the provided hardware and software, which the bootloader is a part of, will void the warranty). So, at the very least, we should leave it as a warning to the community that their warranty might be voided when unlocking the bootloader and/or rooting their phone.
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Click to collapse
My point is that it is useless to try relock your phone.
I agree with you completely in everything you said about warranty. I think there should be warning about warranty. Also there still no need to unlock while we waiting for custom rom (CM).
Anyway I'm more than year on this forum and I never saw someone refused by LG service because their device is modded somehow.

skryptus said:
If the device is bricked, they'll need to find the problem before they solve it. They'll surely run diagnostics on it, and a phone diagnostic tool that doesn't diagnose something as basic as "has someone been messing with the bootloader?" isn't that good of a diagnostic tool at all..
So yeah, I'm pretty sure they'll check it. And even if I weren't, some LG support centers (the portuguese one being one of them) have mentioned that unlocking the bootloader will void your warranty, and the warranty itself mentions it (by saying any change to the provided hardware and software, which the bootloader is a part of, will void the warranty). So, at the very least, we should leave it as a warning to the community that their warranty might be voided when unlocking the bootloader and/or rooting their phone.
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from searching internet about someone bricked his phone with erase bootloader command i found 2 cases on Asus nexus 7 that they got replacement after they erased their bootloader - of course they didn't mention it lol

future81 said:
from searching internet about someone bricked his phone with erase bootloader command i found 2 cases on Asus nexus 7 that they got replacement after they erased their bootloader - of course they didn't mention it lol
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Yes, but Asus's policy wherever that person bought the Nexus 7 might be different that the policy for LG in our respective countries...

I borrow some text from a blog :
This is a joint blog post written together with Carlo Piana with the goal to disband some popular FUD that you lose your warranty if you flash or root your device.
Does rooting your device (e.g. an Android phone) and replacing its operating system with something else void your statutory warranty, if you are a consumer?
In short:
No.Just the fact that you modified or changed the software of your device, is not a sufficient reason to void your statutory warranty. As long as you have bought the device as a consumer in the European Union.
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It clearly states that not only rooting but also flashing your device with a custom rom , can't be held responsible for the defect at a device.
A friend of mine had a faulty screen on his galaxy nexus and gave his device rooted , of course the store who sold the phone refused to repair it , but after being aware of this directive and to avoid further legal actions from the buyer's side, they agreed to repair the phone at no cost.
I relate this case to the thread for the guarantee part since an unlocked bootloader is needed to flash custom stuff to it and is part of the software imho.
This is the source text.
http://matija.suklje.name/rooting-a...t-void-the-warranty-in-eu#footnote-link-255-1

leolipop said:
I borrow some text from a blog :
It clearly states that not only rooting but also flashing your device with a custom rom , can't be held responsible for the defect at a device.
A friend of mine had a faulty screen on his galaxy nexus and gave his device rooted , of course the store who sold the phone refused to repair it , but after being aware of this directive and to avoid further legal actions from the buyer's side, they agreed to repair the phone at no cost.
I relate this case to the thread for the guarantee part since an unlocked bootloader is needed to flash custom stuff to it and is part of the software imho.
This is the source text.
http://matija.suklje.name/rooting-a...t-void-the-warranty-in-eu#footnote-link-255-1
Click to expand...
Click to collapse
It's nice to know that directive. People speak of them having to fulfill the warranty if the root/unlocking isn't directly linked to the problem, but this gives us something to use in case they don't do it voluntarily.
Although, keep in mind that any problem you cause due to your rooting (e.g. deleting system files, freezing the wrong apps, etc.) or bootloader-unlocking (e.g. deleting your bootloader, incorrectly installing a ROM/kernel, etc.) will probably not be covered by warranty, as it was your action that caused the error.

[Q] how can I make my warranty back ?

hey guys
I've rooted my LG 4x P880 and installed a " thinkbridge " 4.4.2 kitkat ROM and that made me lose my warranty sure ,,
now can I unroot my mobile and install the official 4.1.2 software to it or what ?
any help plz
thnx in advance )

hesseny said:
I've rooted my LG 4x P880 and installed a " thinkbridge " 4.4.2 kitkat ROM and that made me lose my warranty sure ,,
now can I unroot my mobile and install the official 4.1.2 software to it or what ?
any help plz
thnx in advance )
Click to expand...
Click to collapse
Using big text doesn't make it any more likely that you'll get a response - it just looks bad
Just flash the origninal KDZ for your device/region and it will be back to 'Stock'. Your warranty shouldn't be affected simply by rooting the phone (certainly in the EU and UK this is true) unless they can prove that you have over-clocked the device and damaged it that way.

SimonTS said:
Using big text doesn't make it any more likely that you'll get a response - it just looks bad .
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Click to collapse
I wrote in big size to make it easier to be read
and can you tell me from where can I get the origninal KDZ for my device/region ?
and thank you so much

Try to connect your phone to your PC and use the LGMobileSupport tool to force an update (It's somewhere in the upper right menu's) That should bring you back to stock and unroot your device. Please note that some repair centers will tell you that you have voided your warranty by unlocking your bootloader/altering the stock firmware, but as long as you are in the EU, like SimonTS said, software alterations don't void your warranty as long as it isn't the cause of a faulty device.
P.S.: In my opinion a bigger font doesn't make the reading any easier, so please stick to the standard size
Sent from my Nexus 7 using xda app-developers app

I'm from Egypt , I called the service center and they told me the root made me lose my warranty , and if I unrooted the mobile my warranty will back ..
now I will download the LG tool and use it .
and ok I'll write in the standard size =D
thanks a lot

SimonTS said:
Using big text doesn't make it any more likely that you'll get a response - it just looks bad
Just flash the origninal KDZ for your device/region and it will be back to 'Stock'. Your warranty shouldn't be affected simply by rooting the phone (certainly in the EU and UK this is true) unless they can prove that you have over-clocked the device and damaged it that way.
Click to expand...
Click to collapse
If he flashed 442 he probably unlocked bl (unless he was going for brick)
If you unlock bl drm keys are modified and even if relocked any service center can tell it has been unlocked
Accepting warranty claims on these basis is usually entirely subjective to the service center's will

Rudjgaard said:
If he flashed 442 he probably unlocked bl (unless he was going for brick)
If you unlock bl drm keys are modified and even if relocked any service center can tell it has been unlocked
Accepting warranty claims on these basis is usually entirely subjective to the service center's will
Click to expand...
Click to collapse
If you are in Europe you are fully covered unless they can prove that the damage is a direct result of unlocking the bootloader - e.g. blown CPU through overclocking. As he is in Egypt he is likely to be on far more dodgy ground.

SimonTS said:
If you are in Europe you are fully covered unless they can prove that the damage is a direct result of unlocking the bootloader - e.g. blown CPU through overclocking. As he is in Egypt he is likely to be on far more dodgy ground.
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Click to collapse
Technically you are correct, but the matter of fact is that even flashing a kernel which is working for everyone without trouble can give them grounds to counter any claim.
You send the phone in most likely for hw failure, kernel and bl control all hw related activity,
hence tracing any issues back to user activity is in fact a brief step, that's why I said that
it's not impossible to get a claim warranty accepted but rather it's entirely subjective..

If I use a custom ROM with root, Do I lose warranty?

Thanks

Yes as soon as you unlock bootloader. But relocking it solve it. But flashing supersu on official rom voids your warranty. And using a custom rom is the greatest villain of warranty. To restore your warranty flash the stock rom , flash stock recovery and lock your bootloader and voila! You get your warranty back. Hope you liked it. Thanks.

Should I follow the same steps than in one plus 3 ? I didnt find any guide for oneplus 3t, do you have the stock recovery?

https://oneplus.net/at/support/answer/will-rooting-or-unlocking-the-bootloader-void-my-warranty
Sent from my HTC One M8 [6.0 Gpe]

No. One plus doesn't void your warranty like everybody else does.

carlinleos said:
Thanks
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Aman Amrit said:
Yes as soon as you unlock bootloader. But relocking it solve it. But flashing supersu on official rom voids your warranty. And using a custom rom is the greatest villain of warranty. To restore your warranty flash the stock rom , flash stock recovery and lock your bootloader and voila! You get your warranty back. Hope you liked it. Thanks.
Click to expand...
Click to collapse
Incorrect! You don't loose warranty with OnePlus Devices. Even if you unlock the bootloader and root etc. Warranty is only void under hardware damage due to a modified device (too much overclock, overvolting the battery and it explodes etc). You are fine dude

manor7777 said:
Incorrect! You don't loose warranty with OnePlus Devices. Even if you unlock the bootloader and root etc. Warranty is only void under hardware damage due to a modified device (too much overclock, overvolting the battery and it explodes etc). You are fine dude
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Click to collapse
Yo that's correct, I apologize but Oneplus clearly mentioned in their policy that they will verify that problem is not because of rooting/unlocking.

Aman Amrit said:
Yo that's correct, I apologize but Oneplus clearly mentioned in their policy that they will verify that problem is not because of rooting/unlocking.
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Click to collapse
That is true, custom roms are usually not a problem. it's when you mess with stuff like battery voltages and overclocking that can (slim chance) cause failures that wont be covered by warranty shouldnt happen with just a custom rom and root though so should be all good.

manor7777 said:
That is true, custom roms are usually not a problem. it's when you mess with stuff like battery voltages and overclocking that can (slim chance) cause failures that wont be covered by warranty shouldnt happen with just a custom rom and root though so should be all good.
Click to expand...
Click to collapse
Yes. No problem btw.

Need help, bought phone, it's on Global ROM but bootloader was relocked

So this is my second Mi Mix. I know my way around it a bit. Anyway I was trying to flash TWRP and it won't work. It appears the bootloader is locked. Apparently the original retailer who sold the phone flashed the global MIUI rom and then relocked the bootloader and reflashed the original recovery.
I have already requested to unlock through Xiaomi but I'm not sure if it will work being on this rom... once I get the text back from them that is.
I'm unable to flash the Chinese stock rom in MiFlash because the bootloader is locked. I've tried just about everything but it appears I'm stuck waiting on Xiaomi to send me the unlock text but my concern is that I won't be able to do it because I'm not on the stock rom.
Any input would be greatly appreciated.

NeutronBomb said:
So this is my second Mi Mix. I know my way around it a bit. Anyway I was trying to flash TWRP and it won't work. It appears the bootloader is locked. Apparently the original retailer who sold the phone flashed the global MIUI rom and then relocked the bootloader and reflashed the original recovery.
I have already requested to unlock through Xiaomi but I'm not sure if it will work being on this rom... once I get the text back from them that is.
I'm unable to flash the Chinese stock rom in MiFlash because the bootloader is locked. I've tried just about everything but it appears I'm stuck waiting on Xiaomi to send me the unlock text but my concern is that I won't be able to do it because I'm not on the stock rom.
Any input would be greatly appreciated.
Click to expand...
Click to collapse
You dont need to request for another unlock code. The unlock code is associated with your Mi Account, meaning you can unlock any Xiaomi device once you sign in with your Mi Account on the device. Once signed in, you just need to use the Unlocking app.
Considering this is your 2nd Mix, I'm assuming you had received an unlock code for the first one. If so, you're good to go. You just need to do as I mentioned above.
If you dont have an unlock code yet, once you've received it, the procedure is fairly simple. Just follow one of the guides here and you'll get to wherever you want,be it Official, EU or a custom ROM.
Hope this helps!
Cheers!

The first one I bought already had the bootloader u locked so I don't have a code. Once I receive a reply from Xiaomi with a code will I be able to unlock even though it's on the global ROM and not stock?

NeutronBomb said:
The first one I bought already had the bootloader u locked so I don't have a code. Once I receive a reply from Xiaomi with a code will I be able to unlock even though it's on the global ROM and not stock?
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Click to collapse
Yes. once you have the code, you can unlock regardless of whatever ROM is installed on the device. FYI, my phone came with a Vendor ROM but locked bootloader just like yours. I don'"t think the Vendor relocked it. I'm assuming that Vendors receive signed Custom ROMs from Xiaomi which is then flashed by Vendors using stock recovery. If they have a signed ROM file, the bootloader doesnt have to be unlocked. It just installs like an update.

NeutronBomb said:
So this is my second Mi Mix. I know my way around it a bit. Anyway I was trying to flash TWRP and it won't work. It appears the bootloader is locked. Apparently the original retailer who sold the phone flashed the global MIUI rom and then relocked the bootloader and reflashed the original recovery.
I have already requested to unlock through Xiaomi but I'm not sure if it will work being on this rom... once I get the text back from them that is.
I'm unable to flash the Chinese stock rom in MiFlash because the bootloader is locked. I've tried just about everything but it appears I'm stuck waiting on Xiaomi to send me the unlock text but my concern is that I won't be able to do it because I'm not on the stock rom.
Any input would be greatly appreciated.
Click to expand...
Click to collapse
Didn't know you had to unlock bootloader for Chinese ROM with miflash, you sure it's not the way you unpacked the file.

Yeah I'm pretty sure it requires bootloader unlock. The first Mix I had was the 128gb version and I sold it last week. Before I sold it the guy wanted me to flash the chinese rom back and I did it using mi flash and it worked just fine. Used the exact same file this time and it won't work, it fails right off the bat. Also in the guide that's posted here for flashing the Chinese rom it says you need the bootloader unlocked.
I guess it's one of those things that people assume the bootloader is already unlocked if you're flashing the Chinese rom since you'd have to have unlocked it already to get off of that rom in the first place.
I'll just sit back and wait for my unlock code I guess. Hopefully they don't take the full 10 days to get back to me.

NeutronBomb said:
Yeah I'm pretty sure it requires bootloader unlock. The first Mix I had was the 128gb version and I sold it last week. Before I sold it the guy wanted me to flash the chinese rom back and I did it using mi flash and it worked just fine. Used the exact same file this time and it won't work, it fails right off the bat. Also in the guide that's posted here for flashing the Chinese rom it says you need the bootloader unlocked.
I guess it's one of those things that people assume the bootloader is already unlocked if you're flashing the Chinese rom since you'd have to have unlocked it already to get off of that rom in the first place.
I'll just sit back and wait for my unlock code I guess. Hopefully they don't take the full 10 days to get back to me.
Click to expand...
Click to collapse
http://xiaomiadvices.com/flash-fastboot-recovery-rom-on-xiaomi-mi-mix/
Unless you got vendor ROM.

satishp said:
I don'"t think the Vendor relocked it. I'm assuming that Vendors receive signed Custom ROMs from Xiaomi which is then flashed by Vendors using stock recovery. If they have a signed ROM file, the bootloader doesnt have to be unlocked. It just installs like an update.
Click to expand...
Click to collapse
Vendor ROMS aren't signed or sanctioned by Xiaomi.
Given Xiaomi doesn't even produce a general Global ROM for some models of it's handsets (such as the Mix) because they only sell them in China, it would make little sense for them to then sign Vendor ROMs for such handsets given they're all but exclusively used by international sellers.

K20 Pro Global - stuck after installation wrong rom

After wrong rom update, phone is in bootloop.
Bootloader is locked.
Pc recognize phone only in edl mode (with TestPoint)
If I install a stock global rom (like when it was new) with Miflash can I restore it?
Wich rom I need to download? Fastboot? Someone can link me a good stock rom? (Global version)
Wich version of MiFlash I need to use?
I try with 2/3 different rom but MiFlash give me error: cannot receive hello packet

With bootloader locked you can't flash trough fastboot. I think the only way to recover is bring to assistance.
How is it possible wrong update? It was an OTA?

dariofreud said:
With bootloader locked you can't flash trough fastboot. I think the only way to recover is bring to assistance.
How is it possible wrong update? It was an OTA?
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Click to collapse
If it was an OTA of the stock ROM he could recover the phone by flashing the stock ROM in recovery mode with MI Flash.
If you flash any ROM other than the stock version that came with the phone (like flashing Global on a phone that came with China ROM) and then relock the bootloader which is the default option in MI Flash then your phone is hard bricked which is something Xiaomi owners have been doing for as long as I've owned Xiaomi phones.
The only way to recover the phone is via an EDL Test point Flash which requires both technical knowledge (the phone needs to be opened and an electrical short created by touching two specific points on the motherboard) and also an authorization code that Xiaomi will never give out.
Bricking the phone this way voids the warranty. Some service centers are willing to try an EDL Test Point reset but the cost is 100% out of pocket for the owner and is paid whether the process works or not.
Most people eventually recognize that they've turned their phone into a paper weight and getting it working again is not going to happen.

jhs39 said:
Bricking the phone this way voids the warranty. Some service centers are willing to try an EDL Test Point reset but the cost is 100% out of pocket for the owner and is paid whether the process works or not.
Most people eventually recognize that they've turned their phone into a paper weight and getting it working again is not going to happen.
Click to expand...
Click to collapse
The situation kinda frustrates me; not because it's happened to me (I hope it never does) but because Xiaomi likely designed the ROM mismatch brick on purpose. If they didn't they know about it now and really should have done more to rectify it.
They've also set the default MiFlash settings to lock on every flash.
I'm guessing they did it to protect their revenue; deter people from importing devices cheaper then flashing the ROM for their region. But I still don't get it in some ways - even with a China handset flashed with a global ROM you're not going to get the network bands you'd get on the regional variant. I'd say that's enough to justify the price difference.
A brick is going too far imo; someone still purchased that hardware with their hard-earned money. Also a major concern for e-waste.
In general I've lost faith in Xiaomi's warranty altogether. I bought a global variant of their handset as I assumed it meant global warranty (Xiaomi earlier misled UK buyers on this by accident via hukd). I was wrong of course; as it's a grey import it's not covered - however I've always considered Xiaomi synonymous with imports. Their phones aren't as widely available here (but that's changing) and their warranty service is restricted to an incredibly small proportion of owners through authorized resellers. It was too expensive to purchase the device domestically. Some argue that you pay for warranty when you buy domestically though I suspect they already factored it into the production cost of each unit anyway.

Phone was bricked after flashing Mi 9T pro rom with fastboot (But phone is K20 PRO)
Phone is "open", I made the Test Point and the phone is seen by xiaomiflash in EDL mode.
How can I do now? I Think I need a K20 PRO Global Rom, someone can post me correct rom for flashing it with xiaomiflash in edl mode?