[Huawei P9 ROMs, Kernels, Recoveries, & Other Devel] Tecalote:
EVA-L09C02B354 (with Vodafone Branding) debrand to EVA-L09c432.

[MENTION=9035933]Alex7620[/MENTION] You are on Stock Huawei Firmware EVA-L09C02B354 (with Vodafone Branding) and you want to debrand to EVA-L09c432. Here is a Guide:

0) Make Backups - after delete your Fingerprints, PINs, Google Account and every other account.

1) If your device is rooted - you must Unroot your device

A) If rooted with SuperSU, open SuperSU App and in settings use Unroot. SuperSU ask you, if you want to restore stock boot.img two times - confirm with YES.

B) If rotted with Magisk, flash latest Magisk Uninstaller with TWRP: http://tiny.cc/latestuninstaller

C) If you are not rooted - skip step 1

2) If you have installed TWRP - you must flash original Huawei Stock EMUI-Recovery for L09C02B354 with Minimal ADB and Fastboot (fastboot flash recovery RECOVERY.img)

A) If you dont have, download update.zip (b354): http://update.hicloud.com:8180/TDS/data/files/p3/s15/G1864/g1755/v111679/f1/full/update.zip

B) Download Huawei Extractor: https://xdaforums.com/showthread.php?t=2433454

C) Unzipp update.zip to get the update.app - with Huawei Extractor extract the RECOVERY.img (not RECOVERY2.img) and delete header file

D) flash RECOVERY.img in Fastboot Mode, soon it is succesful flashed, disconnect USB from device

E) with VOL+ and Power-Button boot to EMUI-Recovery and wipe Cache partiton

If you are not rooted and have only original Firmware without TWRP - you can skip step 1 and step 2

3) Download Downgrade-Package to Android 6 for Europe: (b300 Transition pack for L09) http://download-c.huawei.com/download/downloadCenter?downloadId=91727&version=358124&siteCode=nl

4) Create a folder in the main directory on your external SD and name it: dload

5) Unzipp the C900B300.rar on PC - and copy only the UPDATE.APP into the folder dload on your external SD

6) With Vol+ together with Vol- (press down the button in the middle of + and -) and PowerButton (keep holding this position) you will boot to EMUI Downgrade

7) Now you have b300 in settings /about phone and you must download EVA-L09c432b182: http://update.hicloud.com:8180/TDS/data/files/p3/s15/G1079/g104/v63880/f1/full/update.zip

8) Unzipp update.zip to have UPDATE.APP and META-INF

9) Delete existing update.app in dload folder and copy new update.app and meta-inf to dload

10) With same combination (vol+ vol- and Power) flash b182 - you have then EVA-L09c900b182 on your phone - KEEP THIS FIRMWARE IN dload FOLDER

11) Download L09c432b182-oeminfo-custom.bin_flash.zip and copy it to your external SD: L09c432b182-oeminfo-custom.bin_flash.zip

12) Now check in Fastboot Mode if your Bootloader is still open (FRP unlocked, Bootloader unlocked) , if not, you must reopen it (always same Unlock Code)

13) Unlock Bootloader will make factoryreset with low-lewel wipe (internal storage will be formatted) - dont set any accounts or fingerprint

14) in settings/about phone enable Developer Options (7x click on build number) and in Developer Options enable USB Debugging (OEM-Unlock should be always enabled)

15) Flash TWRP for Android 6 (NOT the one for Android 7) and allow system modification: https://www.androidfilehost.com/?fid=457095661767122229

16) Disconnect USB from device and boot to TWRP with Vol+ and PowerButton (holding until TWRP is booted)

17) Make a TWRP Backup of all shown partions - you can restore in the worst case

18) flash L19c432b182-oeminfo-custom.bin_flash.zip (This zip contains for L19c432b182: oeminfo, custom.bin, build.prop and lib_oeminfo_interface.so)

19) After it is flashed use Restart Button - BUT ATTENTION - in the moment screen is black press VOL+ and VOL- (in the middle) down until EMUI-Software Installing is started.

If you see on screen text with red colour - ignore it, just press Vol+ and Vol- down, if it does not help, press also Power Button to reboot, but keep pressing Vol+ and Vol- because b182 must flashed at this point!

20) Now b182 for L09 will be flashed ( from dload folder!) Wait until 100% is ready and device will restart, but in the moment press down only Vol+ to boot P9 into Stock Recovery instead of system. In Stock Recovery perform Wipe Cache Partition and do Factoryreset - the Factoryreset must be 100% successful!

If on Point 20 Software Installing failed, boot with Vol+ and Power Button to Stock Recovery, make Wipe Cache and Factoryreset - then Restart and press now Vol+ and Vol- again to repeat step 20- or if you was not quick enaugh at Point 20 with the Buttons and you was booted to system instead to EMUI Software Installing - you see a field to enter a password (in this case use your Google Password) Phone will do Factoryreset with low-lewel-wipe after (but not always 100% succesful) if not succesful - in any case (if succesful or not) - doing factoryreset from settings (next step 21) is required!

21) Do second Factoryreset but now from settings /advanced settings / backup reset / Factory data reset / - and be sure you have enabled: "Erase internal storage" - this will do a low-lewel-wipe, which is required (it must be 100% succesful)

22) You are now on L09c432b182

23) SIM-Card must be inserted (you can leave it during all steps in the phone) and you will receive now OTA to another Android 6 Firmware and after OTA to Android 7.

24) Do all OTAs until you are on L09c432b398