Re-locking bootloader of p20 EML-L29 - Huawei P20 Questions & Answers

​ Hi dudes, i must need a help about my phone, and there is no other place that i can turn to. The problem is that i cant find a way to relock p20 bootloader, i've got the code but dont know the method, im new with the phone and i grinde new expiriens and i begging any good guy in the forum for a little boost in the new development.

cropp7 said:
​ Hi dudes, i must need a help about my phone, and there is no other place that i can turn to. The problem is that i cant find a way to relock p20 bootloader, i've got the code but dont know the method, im new with the phone and i grinde new expiriens and i begging any good guy in the forum for a little boost in the new development.
Click to expand...
Click to collapse
Open terminal
-> adb reboot bootloader
-> fastboot oem relock *******(unlock code)
After that you have to factory reset your phone

Schubi97 said:
Open terminal
-> adb reboot bootloader
-> fastboot oem relock *******(unlock code)
After that you have to factory reset your phone
Click to expand...
Click to collapse
Do you did that before with p20 version, i read somewere that there is a chanse to brick phone idk its real

cropp7 said:
Do you did that before with p20 version, i read somewere that there is a chanse to brick phone idk its real
Click to expand...
Click to collapse
I did it several times and had no problems

Schubi97 said:
I did it several times and had no problems
Click to expand...
Click to collapse
Ok thank you a lot, i need it cuz i accidentaly lock my FRP after factory reset and now cant back from 9 beta

Related

[Q] About bootloader unlock

Hi friends, so i want to unlock bootloader on the phone of my wife, but on service menu say allowed "No". Ok i understood in this case in normal way by flashtool or sony developer web not help me. My question is: What exactly mind "bootloader unlock allowed", what it sony lock and reason to dont do it. Next qustion in this case have a other way to change this option to unlock a phone. Thank you in advance and sorry for my bad english. :crying:
raisig said:
Hi friends, so i want to unlock bootloader on the phone of my wife, but on service menu say allowed "No". Ok i understood in this case in normal way by flashtool or sony developer web not help me. My question is: What exactly mind "bootloader unlock allowed", what it sony lock and reason to dont do it. Next qustion in this case have a other way to change this option to unlock a phone. Thank you in advance and sorry for my bad english. :crying:
Click to expand...
Click to collapse
what firmware are you on to?
please update to newest firmware if available, maybe it will solve the bootloader unlock issue,
pradhana said:
what firmware are you on to?
please update to newest firmware if available, maybe it will solve the bootloader unlock issue,
Click to expand...
Click to collapse
I flash with Flashtool both KK-18.3.C.0.37 and JB-18.0.C.1.13 but unlock bootloader dont change.
raisig said:
I flash with Flashtool both KK-18.3.C.0.37 and JB-18.0.C.1.13 but unlock bootloader dont change.
Click to expand...
Click to collapse
if so, don't force to unlock your phone, because it will end up hard brick!
If it says no, it's no. Nobody but Sony can change that. Fact.

bootloader unlock FAILED - password wrong

Hello. I tried to unlock my bootloader on FRD-L19, Nougat 7.0, Emui 5.0 i got the unlockcode, but in adb i get alwas this:
fastboot oem unlock 4014054182370213
...
FAILED (remote: password wrong)
finished. total time: 0.008s
I have controlled every serial number etc. 5 times and used both IMEI-Numbers, everytime "passwort wrong" have i to go back to emui 4.1? or what can be the problem??
thank you
soulbreeder83 said:
Hello. I tried to unlock my bootloader on FRD-L19, Nougat 7.0, Emui 5.0 i got the unlockcode, but in adb i get alwas this:
fastboot oem unlock 4014054182370213
...
FAILED (remote: password wrong)
finished. total time: 0.008s
I have controlled every serial number etc. 5 times and used both IMEI-Numbers, everytime "passwort wrong" have i to go back to emui 4.1? or what can be the problem??
thank you
Click to expand...
Click to collapse
Is OEM unlocking turned on?
adriansticoid said:
Is OEM unlocking turned on?
Click to expand...
Click to collapse
yes! : )
soulbreeder83 said:
yes! : )
Click to expand...
Click to collapse
Then this must be a very serious problem since you said you already played with both IMEIs. I'm thinking...
Rommco05 said:
Check FRP in fastboot is locked or unlocked?
Click to expand...
Click to collapse
There stands:
PHONE Locked
FRP Unlock
What means that? I have unlocked the bootloader once of this device. Then he can be unlocked again, right?
Thank you
soulbreeder83 said:
There stands:
PHONE Locked
FRP Unlock
What means that? I have unlocked the bootloader once of this device. Then he can be unlocked again, right?
Thank you
Click to expand...
Click to collapse
PHONE Locked means your bootloader is locked.
Sent from my Honor 8 using XDA Labs
soulbreeder83 said:
There stands:
PHONE Locked
FRP Unlock
What means that? I have unlocked the bootloader once of this device. Then he can be unlocked again, right?
Thank you
Click to expand...
Click to collapse
Yes, your bootloader is locked.. try again via fastboot to unlock it.
You'll need the original key when you are trying it
the Command is something like "fastboot oem unlock *key*".
I know that. Have you seen my problem?? but, thank you anyway! I need to no why i get "wrong password" and what means "frp unlock".
Rommco05 said:
Check FRP in fastboot is locked or unlocked?
Click to expand...
Click to collapse
I tried it again. It doesn't work fu****g huawei...
I have taken 4 picures when i tried it. Can you find an issue? I don't think that i have made something wrong...
Thank you
I've had the same problem and it turned out that the first bootloader code i used ( with DC unlocker) is different from the one i got on the Huawei website.
So what i did eventually was to pay for the DC unlocker again.
I also downgraded back to MM, because i did not manually relock the bootloader before updating to N, which apparently locks the bootloader in a different way.
So I suggest dowgrading to MM and unlocking there plus relocking it before updating again,
IF you are sure you have the right / original bootloader code you used before,
or
use a 3rd party tool like DC unlocker to get the code.
You might have to downgrade to MM as well with this method . Not sure
Edit: Fyi, never post your IMEI online
Sent from my HUAWEI FRD-L09 using XDA Labs
Rommco05 said:
try via this tool https://forum.xda-developers.com/honor-8/development/tool-huawei-multi-tool-team-mt-t3523923
Click to expand...
Click to collapse
haha... maybe i am damn stupid, but i dont fint out, how to open this tool..?!? there are 34 files in the zip-folder, but no programm to open. i can open command window in this folder.. but its the standart window.. can you explain? maybe i should concat huawei, whats wrong and why i cant unlock my bootloader! and whats "frp unlock"?
oh maaan... don't have nerves for rooting this device... -.-
Thank you, for your help
soulbreeder83 said:
haha... maybe i am damn stupid, but i dont fint out, how to open this tool..?!? there are 34 files in the zip-folder, but no programm to open. i can open command window in this folder.. but its the standart window.. can you explain? maybe i should concat huawei, whats wrong and why i cant unlock my bootloader! and whats "frp unlock"?
oh maaan... don't have nerves for rooting this device... -.-
Thank you, for your help
Click to expand...
Click to collapse
It should either be an exe somewhere or just a bat file.
This tool does the same thing as a command window in the sense of unlocking the bootloader.
As far as I know it won't help with your problem.
Frp ( Factory reset protection) requires you to sign with your google account if enabled or you can't use the phone. ( Theoretically that is, I'm i noob myself so no idea)
But it was "locked" ( same as in your pics that is ) for me as well anf I didn't have a problem with it.
Sent from my HUAWEI FRD-L09 using XDA Labs
SharxX8 said:
It should either be an exe somewhere or just a bat file.
This tool does the same thing as a command window in the sense of unlocking the bootloader.
As far as I know it won't help with your problem.
Frp ( Factory reset protection) requires you to sign with your google account if enabled or you can't use the phone. ( Theoretically that is, I'm i noob myself so no idea)
But it was "locked" ( same as in your pics that is ) for me as well anf I didn't have a problem with it.
Sent from my HUAWEI FRD-L09 using XDA Labs
Click to expand...
Click to collapse
Safety is the enemy of freedom!! -.- Sounds very complicated! (sorry for my bad english). So, i was on android 6.1 and unlocked and rooted it. Than had my problems with root again (maybe the wrong supersu file, or something) Then i have downloaded update.app from hihonor and installed it from the external sd card and everything is working fine on my phone. but i can not unlock it. maybe i have the wrong software for my location ore something like that?
FRP unlock means "You have to unlock"? if its unlocked there will be "FRP unlocked"? i am right?
Maybe i should try the whole procedure from beginning. rollback, update etc.. and then try to unlock. or should i contact huawei?
Thank you and a nice evening *cheers* ^^
SharxX8 said:
I've had the same problem and it turned out that the first bootloader code i used ( with DC unlocker) is different from the one i got on the Huawei website.
So what i did eventually was to pay for the DC unlocker again.
I also downgraded back to MM, because i did not manually relock the bootloader before updating to N, which apparently locks the bootloader in a different way.
So I suggest dowgrading to MM and unlocking there plus relocking it before updating again,
IF you are sure you have the right / original bootloader code you used before,
or
use a 3rd party tool like DC unlocker to get the code.
You might have to downgrade to MM as well with this method . Not sure
Edit: Fyi, never post your IMEI online
Click to expand...
Click to collapse
Can just say that again :laugh:
That's all the advice I have. sorry
Sent from my HUAWEI FRD-L09 using XDA Labs
So finally after reading all posts , plz do downgrade to mm and try to unlock
I have the same trouble, I obtained my unlock key from huawei (I'm not going to give my imei to someone else), but I get wrong password.
How can I downgrade to MM? I'm on linux, so I cannot use that multitool (also, I prefer to make thing manually).
Thank you!
aleritty said:
I have the same trouble, I obtained my unlock key from huawei (I'm not going to give my imei to someone else), but I get wrong password.
How can I downgrade to MM? I'm on linux, so I cannot use that multitool (also, I prefer to make thing manually).
Thank you!
Click to expand...
Click to collapse
For downgrade you need a rollback package..
What is your model number and build number??
I have an honor FRD-L09 with build FRD-L09C432B394
I understood that I nned to rollback to emui 4.1 (android MM), then unlock, but after this step I cannot receive ota's so how can I return back to Nougat stock? And you have a trusted download for the needed packages?
I just want to use Titanium Backup to restore all my stuff... and some modifications (pixel launcher, magisk with some modules, viper audio, ad block, something this simple), nothing usually complex!
Thank you!
aleritty said:
I have an honor FRD-L09 with build FRD-L09C432B394
I understood that I nned to rollback to emui 4.1 (android MM), then unlock, but after this step I cannot receive ota's so how can I return back to Nougat stock? And you have a trusted download for the needed packages?
I just want to use Titanium Backup to restore all my stuff... and some modifications (pixel launcher, magisk with some modules, viper audio, ad block, something this simple), nothing usually complex!
Thank you!
Click to expand...
Click to collapse
For downgrade process you don't need to unlock bootloader..when you downgrade you will receive OTA updates..
To use TB you need root..which is required unlock bootloader..
Why you want to go back to MM BTW??
hassanjavaid8181 said:
For downgrade process you don't need to unlock bootloader..when you downgrade you will receive OTA updates..
To use TB you need root..which is required unlock bootloader..
Why you want to go back to MM BTW??
Click to expand...
Click to collapse
I don't want to go back to MM, but as long as I understood this is a needed step to unlock my bootloader.
I experienced the same trouble of the thread creator: the password that huawei gave me is invalid.
SharxX8 said:
I also downgraded back to MM, because i did not manually relock the bootloader before updating to N, which apparently locks the bootloader in a different way.
So I suggest dowgrading to MM and unlocking there
Click to expand...
Click to collapse
My target is to stay at android nougat, with root (magisk if possible).
But with nougat I cannot unlock my bootloader...

Unable to unlock bootloader (OEM unlocking disabled)

Hello,
I couldn't unlock the bootloader as the OEM unlocking's disabled and i can't access system! Everything's erased!
Any help????
A bit more info might be helpful mate.
What did you do to arrive at the situation you are in?
Can your pc see your device via ADB and if so what are you using: latest platform tools or toolkit?
Can you boot to stock recovery or bootloader?
Without any of the above info its going to be extremely difficult for anyone to give any kind of answer.
junglism93 said:
A bit more info might be helpful mate.
What did you do to arrive at the situation you are in?
Can your pc see your device via ADB and if so what are you using: latest platform tools or toolkit?
Can you boot to stock recovery or bootloader?
Without any of the above info its going to be extremely difficult for anyone to give any kind of answer.
Click to expand...
Click to collapse
The device isn't recognized via ADB.
I can boot to Bootloader
The phone was working fine with the latest google stock android 10, i decided to lock the bootloader cuz the phone was getting overheated so i thought it'd be a good idea to lock the bootloader. Prior to do that, it asked me to erase everything! I erased everything and when i tried to reinstall the stock image it asked me to unlock the bootloader!!
The problem is that USB debugging isn't enabled and the phone is empty with no system!
eldeen said:
The device isn't recognized via ADB.
I can boot to Bootloader
The phone was working fine with the latest google stock android 10, i decided to lock the bootloader cuz the phone was getting overheated so i thought it'd be a good idea to lock the bootloader. Prior to do that, it asked me to erase everything! I erased everything and when i tried to reinstall the stock image it asked me to unlock the bootloader!!
The problem is that USB debugging isn't enabled and the phone is empty with no system!
Click to expand...
Click to collapse
Ouch! That's a right old situation you have there mate, with no OS installed a locked bootloader and no ADB function I'd have to say your phone is non recoverable!
Sorry mate but I can't see anyway out of that lot.
Maybe someone else a bit more knowledgeable might chip in but I'm deffo out of ideas.
junglism93 said:
Ouch! That's a right old situation you have there mate, with no OS installed a locked bootloader and no ADB function I'd have to say your phone is non recoverable!
Sorry mate but I can't see anyway out of that lot.
Maybe someone else a bit more knowledgeable might chip in but I'm deffo out of ideas.
Click to expand...
Click to collapse
Thanks for help anyway,
But there must a solution to this! I mean my phone isn't under warranty and I'm willing to go for paid services to unlock the bootloader!
eldeen said:
Thanks for help anyway,
But there must a solution to this! I mean my phone isn't under warranty and I'm willing to go for paid services to unlock the bootloader!
Click to expand...
Click to collapse
Try switching slots, assuming the pixel is an A/B device. Maybe you still have a bootable system in your other slot and I don't think you need an unlocked bootloader to switch slots
AndroidNazi said:
Try switching slots, assuming the pixel is an A/B device. Maybe you still have a bootable system in your other slot and I don't think you need an unlocked bootloader to switch slots
Click to expand...
Click to collapse
Thanks for help, but could you please show me how to do that?
eldeen said:
Thanks for help, but could you please show me how to do that?
Click to expand...
Click to collapse
Make sure you have the latest fastboot. On the bootloader your phone will either say "slot a" or "slot b" and you should type "fastboot --set-active=b" if you are on slot a or "fastboot --set-active=a" if you are on slot b
still didn't fix the problem... any probable solutions please?

Question Can´t access to fastboot

I am trying to unlock my nord ce 2 bootloader but everytime I try to access bootloader mode, it says something like Unlock_Verify_device ok and then reboots
how can I unlock the bootloader? Same happens on my nord 2. Oem unlocking is enabled and I have no selection of advanched startup options. I have magisk boot.img to flash
Can't say I experienced that myself. The message you got looks promising. The 'unlock_verify_device ok' message means you're getting to fastboot. But I'm not sure why it's rebooting. Do you have enough time to run the command 'fastboot devices'?
Also, what version is your firmware?
Here is the guide I used when I was unlocking the bootloader: https://www.droidwin.com/how-to-unlock-bootloader-on-oneplus-nord-ce-2/
I am running android 12 beta on oxygenos
Edit: fastboot doesn´t even find the device
Oh, now it tells that serial is not match. what's going on?
so? Can anyone help? Phone keeps saying that serial is not match and then reboots. Is this phone just a joke or something? Gonna buy samsung if yes.
What model is your phone? I wasn't aware of the Android 12 beta being available for the Nord CE 2. Another thing to try is this tutorial to manually install the OnePlus drivers: https://www.droidwin.com/fix-android-device-not-showing-in-fastboot-mode/
Was looking on the nord ce 1 xda Forum. It's only recently that a few roms and twrp are starting to appear, so there is hope. IMO oneplus need to take £$50 off the price, more users = more chance of getting more development
mr_munch said:
Can't say I experienced that myself. The message you got looks promising. The 'unlock_verify_device ok' message means you're getting to fastboot. But I'm not sure why it's rebooting. Do you have enough time to run the command 'fastboot devices'?
Also, what version is your firmware?
Here is the guide I used when I was unlocking the bootloader: https://www.droidwin.com/how-to-unlock-bootloader-on-oneplus-nord-ce-2/
Click to expand...
Click to collapse
I don't have fastboot on my device Nord ce 2 ..when I type fastboot reboot bootloader then it directly reboot into my device ..Please somebody help me.Im on current Android 12.1 version
neilop7 said:
I don't have fastboot on my device Nord ce 2 ..when I type fastboot reboot bootloader then it directly reboot into my device ..Please somebody help me.Im on current Android 12.1 version
Click to expand...
Click to collapse
Fastboot is stuffed on this device. There's no longer a way to make fastboot work.
burningcreation said:
Fastboot is stuffed on this device. There's no longer a way to make fastboot work.
Click to expand...
Click to collapse
I wanna unlock bootloader..is there any way to unlock ?
neilop7 said:
I wanna unlock bootloader..is there any way to unlock ?
Click to expand...
Click to collapse
No unfortunately.
burningcreation said:
No unfortunately.
Click to expand...
Click to collapse
Did you able to unlock bootloader?
neilop7 said:
Did you able to unlock bootloader?
Click to expand...
Click to collapse
No I am not able to unlock the bootloader either. There is currently nothing we can do.
Hi everyone, any update on this? Did someone manage to unlock the bootloader?
If I'm not mistaken. You can rollback to android 11 to get it back.
I'm currently facing the same problem, so I tried rolling back and have downloaded over 20 rollback zips now, and extracted them. All won't work, it reboots in recovery. And it is like fastboot just doesn't exist. So yeah they probably messed it up.
I'm so sad, I switched from Iphone to Oneplus partly because of the rooting options. So sad
Can I do this trough adb or not?
NiekKamer0105 said:
I'm currently facing the same problem, so I tried rolling back and have downloaded over 20 rollback zips now, and extracted them. All won't work, it reboots in recovery. And it is like fastboot just doesn't exist. So yeah they probably messed it up.
I'm so sad, I switched from Iphone to Oneplus partly because of the rooting options. So sad
Can I do this trough adb or not?
Click to expand...
Click to collapse
You don't extract it though. You just rename it by removing the _Rollback at the end.
See here: https://droidwin.com/downgrade-oneplus-nord-ce-2-from-android-12-to-android-11/

General re-locking bootloader problem

I tried for my first time to unlock my phone's bootloader and thought it was something really easy to customize the
phone firmware on the other hand was not what I thought and I don't know much about computer science or customizing a firmware;
and then without being able to install a root or any modification I decided to re-lock the bootloader (because i dont want it anymore) only that I did not succeed with various tutorials and I did not find any for the samsung galaxy a12. I just unlocked the bootloader from developer options settings and ran what the tutorial said on how to activate it without installing a root or customization of anything.
can someone please help me.
bootloader problem said:
I tried for my first time to unlock my phone's bootloader and thought it was something really easy to customize the
phone firmware on the other hand was not what I thought and I don't know much about computer science or customizing a firmware;
and then without being able to install a root or any modification I decided to re-lock the bootloader (because i dont want it anymore) only that I did not succeed with various tutorials and I did not find any for the samsung galaxy a12. I just unlocked the bootloader from developer options settings and ran what the tutorial said on how to activate it without installing a root or customization of anything.
can someone please help me.
Click to expand...
Click to collapse
Which model are you using?
Allehandro said:
Which model are you using?
Click to expand...
Click to collapse
You mean the model code?
bootloader problem said:
You mean the model code?
Click to expand...
Click to collapse
Yeah which A12 model number do you have?
Allehandro said:
Yeah which A12 model number do you have?
Click to expand...
Click to collapse
SM-A127F/DSN
bootloader problem said:
SM-A127F/DSN
Click to expand...
Click to collapse
Well it shouldn't be hard really. How did you unlock it in the first place?
Wait, is it really so hard to lock the bootloader on Samsung devices? Makes me think twice about buying one now if I can't simply lock it with a command like fastboot oem lock.
eclipsek20 said:
Wait, is it really so hard to lock the bootloader on Samsung devices? Makes me think twice about buying one now if I can't simply lock it with a command like fastboot oem lock.
Click to expand...
Click to collapse
It's not hard to relock as its not hard to unlock it.
If you've followed any unlocking bootloader tutorial, after enabling OEM unlock option, you have to enter downlod mode and long press the volume up to enter unlock mode and then procedd to actually unlocking it.
For relocking it, just go to the download mode again, then long press the volume up and you'll have the option to re-lock it.
eclipsek20 said:
Wait, is it really so hard to lock the bootloader on Samsung devices? Makes me think twice about buying one now if I can't simply lock it with a command like fastboot oem lock.
Click to expand...
Click to collapse
Samsung phones have a download mode instead of a fastboot mode, so you can't use commands like fastboot oem unlock
Allehandro said:
Well it shouldn't be hard really. How did you unlock it in the first place?
Click to expand...
Click to collapse
Allehandro said:
Well it shouldn't be hard really. How did you unlock it in the first place?
Click to expand...
Click to collapse
with developer options i activated the OEM unlock option then i turned off my phone and i held the volume up and down with a cable connected to the pc, i went to download mode i held down the volume up and asked me to activate the bootloader and I confirmed by clicking the volume up
bootloader problem said:
with developer options i activated the OEM unlock option then i turned off my phone and i held the volume up and down with a cable connected to the pc, i went to download mode i held down the volume up and asked me to activate the bootloader and I confirmed by clicking the volume up
Click to expand...
Click to collapse
Now go to download mode again and hold down volume up, you'll see option to lock it again
Allehandro said:
Now go to download mode again and hold down volume up, you'll see option to lock it again
Click to expand...
Click to collapse
it worked thank you so much!
bootloader problem said:
it worked thank you so much!
Click to expand...
Click to collapse
No problem. Happy to help

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