[Nokia 8.3 5G (8V 5G UW) Guides, News, & Discussion] hikari_calyx:
If you're looking for how to unbrick the phone that received May 2023 Security Update, you've come to the right place.

You have two options to unbrick your Nokia 8.3

If you prefer not to unlock the bootloader, visit here:

https://xdaforums.com/t/guide-how-to-unbrick-nokia-8-3-affected-by-may-2023-security-patch.4592205/

Or if you don't mind unlocking the bootloader, do these steps before you proceed to bootloader unlock:

1. Use volume key to select "Recovery mode", power key to enter.

2. When you see android robot lying on the ground, hold power key and press volume up key once. Then you'll get recovery screen.

3. Download this package: https://android.googleapis.com/packages/ota-api/package/627142c637bf373410e6b8911aeb9b2e65bd5969.zip

4. Select Apply Update from ADB, then sideload it with adb command.

5. Once the sideload procedure finishes, select "reboot to bootloader", then follow this guide to unlock the bootloader.

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, but there's a known workaround for this.

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.

Click this for Android 11 or Android 12 users

Your warranty will be void as bootloader unlock is not reverseable - you cannot relock it. Prototype ABL for normal Nokia 8.3 and 8V 5G UW are not interchangeable, flashing wrong ABL image will cause your phone hard brick.

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.

UPDATE: Russian version Nokia 8.3 5G cannot be downgraded yet. If you're using Russian version Nokia 8.3 5G (Software version has RU tag), use EDL method for bootloader unlock.

Please download the prototype bootloader from here:

Click here for Nokia 8.3 5G (BGT TA-1243/1251)

Click here for Nokia 8V 5G UW (RAV TA-1257)

If you see Error code 00000101 during download - please use industrial standard web browser to download it, like Google Chrome.

SHA256

Nokia 8.3 5G: e253b67fa028b1ea9ca714bee6d95902e2b340ae201e0c88adc12781279b8fd5
Nokia 8V 5G UW: 70391abce694c95d7bb9d2c3fa1bcbfd66f26f42a766bc8d8c4d222caf8a62d4

Root Key Hashes

Nokia 8.3 5G: E3B22179CCBFB91730E233C4162E2D9DD33D02C97289EC1E9F787AC52CBDE3E0
Nokia 8V 5G UW: C3CEDC3A4612C85DD70EEDFA8ABA75621D579CEA62BB9A8D805DD4E9C542A6F0

(For Nokia 8.3 5G only), flash it under fastboot mode, and unlock the bootloader - pretty simple:

fastboot flash abl BGT-abl.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:

For Nokia 8V 5G UW only:

1. Ask someone who has access of HDK to grant service permission for you.

2. Execute these commands (please download frp_oemunlock.img from https://xdaforums.com/t/prototype-abl-binary-from-nokia-xr20-for-bootloader-unlock.4455845/ ):

fastboot flash abl_a RAV-abl.elf
fastboot flash abl_b RAV-abl.elf
fastboot reboot-bootloader
fastboot flash frp frp_oemunlock.img
fastboot reboot-bootloader
fastboot flashing unlock_critical
(confirm unlock)
fastboot flashing unlock
(confirm unlock)

Have fun for modding this device!