[Huawei P9 Lite Guides, News, & Discussion] vok01:
In a lot of Facebook Groups, there are people asking about downgrade from Nougat to Marshmallow.

In my case, Im from México and every week there are at least 2 or 3 people asking about to return their devices to AT&T Marshmallow firmware.

I bring this little guide to show you how to do it, I hope that it could be helpful to you.

/*
* Your warranty is now void.
*
* I am not responsible for bricked devices.
* YOU are choosing to make these modifications.
*/

Preparation:

You will need to download this files:

- Recovery Installation:

Google Drive Link: https://drive.google.com/open?id=0B0rGM0R-mSexMmFUSzJ3SlZsclk

Mega Link: https://mega.nz/#!BEFiETSL!c5L5kDcA2RVAvKYmQLEvd3B-8lYFv86IEHo83DXGxNg

Dropbox Link: https://www.dropbox.com/s/ayq9zfrk3ncf5i0/TWRP%20nougat.rar?dl=0​

This file contains a file .bat, just open it and follow the instructions on the screen

- OEMInfo C212

Google Drive Link: https://drive.google.com/open?id=0B0rGM0R-mSexREJNeDJndm1VZm8

Mega Link: https://mega.nz/#!kRFSmaiI!eN7q9382qQqT0ULmZg-hKwDtgxEDlWds4flwB0YGMl0

Dropbox Link: https://www.dropbox.com/s/nf93zsduhfmpfjt/OEMINFO%20C212%20ATT.zip?dl=0​

- Firmware L23C212B130

Dropbox Link: https://www.dropbox.com/sh/5kvpa2uqqzunznb/AABruT785fikTkoPVcym5hF4a?dl=0

Mega Link: https://mega.nz/#F!oRlizARZ!cx0b32yCvXpV3e7oYRC1JQ

Google Drive: https://drive.google.com/open?id=0B0rGM0R-mSexX2RHVkJRTDBUQzg

Huawei Mexico Official Page: http://download-c1.huawei.com/download/downloadCenter?downloadId=92443&siteCode=mx​

How to do it:

Follow this steps carefully, I will not be responsible for damages on your device!

If you will use "Internal Storage" to install the files, put them there after unlock your bootloader, otherwise it will be erased

Ok, let's start the guide:

1. Unlock your bootloader and be sure that your device has USB Debug and OEM Info activated

2. Put your device in Fastboot Mode (Vol - and plug the usb cable connected to the PC) and execute the file "P9 LIte TWRP Installation.bat" and follow the instructions, it will install on your computer the Huawei Drivers if you don't have it.

NOTE: In the rar file there are two "twrp.img" (twrp.img and twrp2.img), I set "twrp.img" by default, this file is the original recovery from TWRP, you can install all the files from internal storage if you dont have Micro SD. The file "twrp2.img" let's you install the files only from the Mico SD card. Please, use the file that you find better.

3. After the Installation your phone will restart, once it do it copy the dload folder and OEMInfo to your SD or Internal Storage root and restart your device into Recovery Mode (Vol + and Power).

4. In Recovery Mode, please find the file "OEMINFO C212 ATT.zip" on your Micro SD Card or Internal Storage and flash it.

5. After that, power off your device and press the three buttons (Vol -, Vol + and Power) and wait for the dload installation.

In some cases the installation ask you for a password, you can enter any password, when it shows you a decrypting data error, it will do a factory reset and inmediately will start the firmware.

And it's all :highfive:, please DO NOT DO A FACTORY RESET AFTER THIS INSTALLATION, you can softbrick your device.

After this installation, if you want to install future OTA's, you need to install again the firmware through dload method, follow the step 5, this installation will let you relock your bootloader and install future OTA's through Huawei's system updater

Specially thanks to:

EloyGomez

KingOfMezi

CATUVA 21

With their videos and files was so easy to downgrade this device