This guide has been written with visual graphics to help users better understand the whole process.

Disclaimer

Originally this guide has been posted on XDA forum, and credit goes to real developers who have found this work around.

Photos has been provided by Mr. Alex from Germany who’s phone was converted successfully with my cooperation.

Lets start

Alex was running B175 on Chinese mate9 as you can see in following photo.

Steps to follow

You need good quality sd card with atleast 8GB free space

Backup all important data

Charge battery up to 50%

Enable OEM unlock in developer options

Enable USB debugging

Unlock your bootloader by following THIS GUIDE

Download TWRP from THIS LINK

Download Asian (MHA-L29C636) OEM info from THIS LINK

Download MHA-L29C636B110 firmware from THIS LINK

Switch off phone, hold volume down and connect with pc, phone will enter fastboot mode.

Now go to “ Minimal ADB and Fastboot ” folder in C:/Program Files (You have installed when unlocking bootloader) and copy ” twrp-3.0.2-2-hi3660.img ” to that folder.

” folder in C:/Program Files (You have installed when unlocking bootloader) and copy ” twrp-3.0.2-2-hi3660.img ” to that folder. Then open MAF32.exe and type fastboot devices and press enter, if it shows your device serial number, it means connection is successful.

Now type ” Fastboot flash recovery twrp-3.0.2-2-hi3660.img ” and press enter. if it shows Ok: finished …

Then disconnect phone from PC and reboot to twrp recovery (Power + Volume up) keep them hold, or switch off and hold volume up key and connect with pc.

Following screen will be presented on your phone screen, Don’t press any button just swipe blue bar.

On next screen you will see TWRP menu, tap on Wipe then press format data, type yes and wipe to format data.



Then go back to main menu again, and tap on Backup button, you will see all partitions, only select oeminfo and then swipe to make backup.

If backup is successful you will see the path where this backup is being saved, normally it is inside TWRP >Backups>serial number>your build number. as you can see in following image.

Now reboot to normal mode, if twrp ask to install any app just ignore it. and reboot

Now copy that oeminfo to safe place, this is backup of regional file of your phone.

Now extract the C636oeminfo zip that you have downloaded earlier, and copy all files inside to to your backup folder and replace your original files with the downloaded one.

Now extract asian firmware dload.rar file and copy that dload folder to sd card,

Download update data zip from THIS LINK

Now switch your phone off and boot to TWRP recovery again, swipe on 1st screen, then tap on Restore button, there will be only one backup , select it and swipe to restore.

Now turn off phone, disconnect from PC. and hold 3 buttons (volume up, volume down, power) and it should start installation of Asian firmware.

Once finished, again enable oem unlock, unlock bootloader again,enable USB debugging, and install TWRP recovery, as you did at start.

Then tap install and select zip file ” update_full_hw_spcseas.zip” and swipe to flash.

You will get error 7 at the end, as shown in image below, but don’t worry.

Then turn off phone again, and use 3 button method to install asian firmware again. After installation your bootloader will lock again and you will not get any warning at boot.

Then go in setting and do a factory reset.

Once reset finish, boot phone to normal mode, and check build number, voila you will have MHA-L29C636B110. as you can see in image below

And after that user started receiving OTA one by one. as you can see in image below.