[GUIDE] How to unlock the bootloader for Nokia 8.3 5G

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hikari_calyx

Senior Member
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Existing Android 10 builds has a critical problem, that allowed us to flash or erase any bootloader partition even if the bootloader is not unlocked. However, Android 11 builds blocked this method.

Therefore, I think it's time to disclose the unlock method now. It's known working on both TA-1243 and TA-1251.

The critical part for unlocking the bootloader is - the prototype bootloader of this phone. By opportunity, I got the early bootloader from a prototype unit that allows us to unlock the bootloader, thanks to the help of a Canadian people who claimed to have a Nokia 8.3 prototype himself.

Your warranty will be void as bootloader unlock is not reverseable - you cannot relock it. We didn't try this method on Nokia 8 V 5G UW due to lack of units, so take your own risk if you wanted to give it a try. You've been warned.

To use this method, you need to ensure your phone has Android 10 installed - the latest build that we can use this method is 00WW_1_150-B01, you can confirm this by dialing *#*#7837#*#*.

If your phone has Android 11 installed (00WW_2_180-B01 or newer), then this bootloader unlock method has been blocked, but there's known workaround for this. Check 2nd reply for details.

Please download the prototype bootloader from here:
Click here

Then flash it under fastboot mode, and unlock the bootloader - pretty simple:
Code:
fastboot flash abl abl_proto.elf
fastboot reboot-bootloader
fastboot oem unlock-go

Confirm unlock on your phone and it's all done. You can safely update the phone to Android 11 right after unlocked. Since we cannot perform critical unlock properly, we can only do regular unlock, but this should be enough.

Video demonstration:

Have fun for modding this device!
 
Last edited:

hikari_calyx

Senior Member
If you don't mind take apart your phone, you can use EDL method - but you know doing so will definitely void the warranty, and the stubborn triple-color company could remove these pads in later batches.

Firehose programmer for this phone is attached here.
 

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Last edited:

hikari_calyx

Senior Member
For archiving purposes:
00WW_1_150-B01 full OTA zip: https://android.googleapis.com/packages/ota-api/package/627142c637bf373410e6b8911aeb9b2e65bd5969.zip
00WW_2_180-B01 full OTA zip: https://android.googleapis.com/packages/ota-api/package/12a35835cf4034f539ae7d03ffecd0682bef1b66.zip

You can use them for OS rooting.

Also after @jnappert 's testing, the workaround works great.
1. Sideload 00WW_1_150-B01 OTA package under recovery. You may see downgrade not allowed prompt but it will install anyway.
2. Reboot to bootloader under recovery mode. Although Anti-Rollback protection is triggered, the abl is not protected and is now downgraded to vulnerable build.
3. You can now follow the guide to unlock the bootloader.

I hope this will help everybody to bring up custom rom development for this phone.
 
Last edited:

Volski_

Member
Jul 19, 2019
37
3
Existing Android 10 builds has a critical problem, that allowed us to flash or erase any bootloader partition even if the bootloader is not unlocked.

Does that mean that they forgot to blow eFUSE of secure boot in this model? On a different device, once I flashed tampered ABL image after unlocking (and unlock_critical) the blootloader, XBL refuses to load ABL because of tampering. It hard bricked the device, but EDL mode was working.

It could be that ABL_proto image that you extracted might be signed by the OEM.
 
Last edited:

hikari_calyx

Senior Member
Does that mean that they forgot to blow eFUSE of secure boot in this model? On a different device, once I flashed tampered ABL image after unlocking (and unlock_critical) the blootloader but XBL refuses to load ABL because of tampering. It hard bricked the device, but EDL mode was working.

It could be that ABL_proto image that you extracted might be signed by the OEM.

It's signed by OEM - you can compare it yourself.
In demonstration video, the secure boot is already enabled as you can see.
 

jnappert

Member
Aug 23, 2010
28
7
I tried downgrading to Android 10 yesterday und sucessfully unlocked bootloader (which deletes user-data). Then the OTA Update to 00WW_2_200 installed without problem.
 

TheDuke94

Member
Jul 20, 2016
24
9
Treviso
I tried to downgrade mine from Android 11 to 10. Anyways, when i sideload the "update", the recovery text "downgrade not allowed". When it finishes the install, my phone just boot in fastboot mode and the only way to get it back is to install the Android 11 update. Still waiting any tips to downgrade
 

jnappert

Member
Aug 23, 2010
28
7
can you please type here the steps you've made to downgrade your phone?
I downgraded from 00WW_2_180 to 00WW_1_150-B01:
- installed adb and drivers
- enabled USB Debug
- bootet to stock recovery: "adb reboot recovery"
- in recovery "apply update from adb"
- adb sideload 00WW_1_150-B01 from post #3
- rebootet to fastboot and continued with steps from post #1 to unlock bootloader
- after reboot device updated directly to 00WW-2_200

Now i am looking for working custom recovery...
 
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hikari_calyx

Senior Member
I downgraded from 00WW_2_180 to 00WW_1_150-B01:
- installed adb and drivers
- enabled USB Debug
- bootet to stock recovery: "adb reboot recovery"
- in recovery "apply update from adb"
- adb sideload 00WW_1_150-B01 from post #3
- rebootet to fastboot and continued with steps from post #1 to unlock bootloader
- after reboot device updated directly to 00WW-2_200

Now i am looking for working custom recovery...

Thanks for sharing the tip. But apparently the triple-color company will block this😂
 
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Dani897

Senior Member
Aug 16, 2010
3,615
670
I was lucky enough to get this phone from bh photos as shelf stock and it shipped with android 10. They are currently on sale there for $320. I installed and unlocked bootloader. I may get a pixel as a backup so id be willing to test recovery,roms etc...when someone comes up with something. Ive been out of the Android scene for a while and im curious if root is possible at this time or if that would require 3rd party recovery and/or a kernel
 

mingkee

Senior Member
May 5, 2006
3,384
820
Brooklyn, NY
A little update
Bootloader unlocked
This time is a bit tricky
I tried to enter recovery and got "no command". Press volume up + power together every 2 seconds and I got actual recovery
Tried update from SD...no go
Tried update from adb... downgrade is not allowed
Somehow I went to fastbootd and nothing worked
I chose bootloader and this time elf file from post 1 worked (it didn't work when I enter bootloader normal way)
Now I have to find out where I can get boot to patch
 

hikari_calyx

Senior Member
A little update
Bootloader unlocked
This time is a bit tricky
I tried to enter recovery and got "no command". Press volume up + power together every 2 seconds and I got actual recovery
Tried update from SD...no go
Tried update from adb... downgrade is not allowed
Somehow I went to fastbootd and nothing worked
I chose bootloader and this time elf file from post 1 worked (it didn't work when I enter bootloader normal way)
Now I have to find out where I can get boot to patch

You can extract boot image from OTA package via payload dumper.
 

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