[Huawei P9 Lite Guides, News, & Discussion] :
5.

UNBRICKING, DOWNGRADING, SWITCHING ROMS

UNBRICKING EMUI 4.1

•Use when on stock EMUI 4.1 STOCK ROM ONLY

•Have a SDCard with at least 4Gb free space

•Have a PC with a SDCard reader

Note: This process uses the: " Three buttons method aka. Dload method and it will lock your bootloader (if unlocked) and restore stock recovery.

Procedure:

1.Create a folder named "dload" in the root of the SDCard (without quotation marks)

2.Extract UPDATE.APP file from b160.zip (you can find it in post 1.) update correspondingly to your phone model.

3.Place UPDATE.APP file in the dload folder on the SDCard

4.Insert SDCard in the phone

5.Press all three buttons (Vol+ & Vol- & Power)

6.I would recommend rebooting to ERecovery (Vol+ & Power) and factory reseting

7.After process is done your phone will have it's bootloader locked (if unlocked beforehand) and restored original Huawei Recovery

UNBRICKING AND DOWNGRADING FROM EMUI 5

•Use if you are on EMUI 5 STOCK ROM ONLY

•Have a SDCard with at least 4Gb free space

•Best for unbricking or having issues with encryption

•If not getting OTA updates

•Downgrading to EMUI 4.1

•If stuck with NRDM90 test-keys

Note: From my experience if you have problems with EMUI 5 this is the best method to recover from various sorts of issues. It will lock your bootloader (if unlocked) and restore stock recovery because it uses the " Three buttons method aka. Dload method

VNS-L11 Rollback package

VNS-L21 Rollback package

VNS-L21 Rollback package Alternative

VNS-L22 Rollback package

VNS-L31 Rollback package

This file is a rollback package which enables downgrading from EMUI 5 to B160 firmware listed in the 1. post. It will restore stock recovery and also change your phone version number to C900B300 (don't worry about it).

Procedure:

1.Create folder "dload" (without quotation marks) on the root of the SDCard

2.Extract UPDATE.APP from the rollback package corespondingly to your model number and place it in the dload on the SDCard.

3.Insert SDCard and power off the phone

4.Press Vol+ & Vol- & Power and let the rollback package to flash

5.Power off and take out the SDCard

6.Remove the UPDATE.APP from the dload folder on the SDCard

7.Download B160 update.zip (provided in 1. post) correspondingly to your model number and extract the UPDATE.APP in the dload folder on the SDCard

8.Insert SDCard and press Vol+ & Vol- & Power

9.Wait untill it finishes, you will end up with a locked bootloader (if it was unlocked beforehand)

10.I recommend rebooting to ERecovery (Vol+ and Power) and factory reseting

11.You will end up with stock EMUI 4.1

12. Update to EMUI 5 using the official updater inside Settings

SWITCHING ROMS

Note: This information is only provided so that anyone using Meticulus ROMS could downgrade without problems

Meticulus ROMS to EMUI 4.1

•Have a stock EMUI 4.1 system dump located on your SDCard in folder "meticulus" with boot.img and system.img in it.

•Working Meticulus TWRP

•For more information join our Telegram group

1.Reboot to TWRP

2.Press Advanced > Extras > Restore Dump

3.Wait, it will take about 15-20 minutes depending on your SDCard speed

4.Reboot and boot up

Or (WARNING! I DIDN'T DO THIS, DO IT ON YOUR OWN RISK)

•Have a SDCard with 4Gb free space

1.Create folder "dload" (without quotation marks) on your SDCard

2.Download B160 update.zip correspondingly to your model number, extract UPDATE.APP from it and place in the dload folder

3.Insert SDCard in the phone and press Vol+ & Vol- & Power

4.Wait for the firmware to flash

5.This will theoretically relock your bootloader and restore stock recovery

6.Enter stock recovery and preform a factory reset to remove encryption