[Huawei Mate 9 Guides, News, & Discussion] ernest2728:
Hello everyone, I leave here step by step how to return from Oreo Beta to Nougat along with a video that I made with the process step by step, greetings.

NOTE: THIS PROCESS WAS TESTED AND WORKS, IT MUST BE CLEARED THAT THIS PROCESS IS UNDER YOUR RESPONSIBILITY, IF YOU FOLLOW THE STEPS YOU WILL NOT HAVE ANY PROBLEM, ONLY YOU ARE RESPONSIBLE FOR BRICK.

COMMUNICATION GIVEN BY THE COMPI [MENTION=5655108]kacarot[/MENTION], "ONLY YOU ARE RESPONSIBLE FOR YOUR TELEPHONE"

Look to read by xda and in androi hilfe who are warning that this system is dangerous and that there is a step where you can produce the brick .... I have only read a case of brick (recovered with fh) but several cooks insist on warning the risks ..... From what I read the failure can be given to clean data from twrp and copy the new oeminfo ... There may fail ....

Perhaps it would be prudent to notice well that in the mentioned forums they are withdrawing the instructions ...

COPIO flashdance user post very advanced

It is not advisable for any fan to do it! The trick with dd if =

is that you have to delete the data before in the TWRP to obtain a "normal file structure". You can verify that in the installation. Only if there are no numbers / combinations of letters can you be in Advanced in the TWRP with cp .... and dd if = make and wait until you have finished exchanging the message. Only then can you turn it off and then with VOL + / VOL- and Power of the SD starts the update and waits until it finishes. Then the HWOTA arrives at Zug. Yes, that's just with this rom and the dload folder in the root directory of the SD.

TELEPHONE PREPARATION

1. Activate OEM unlocking

2. Enable USB debugging

3. Have installed the Minibus ADB Fastboot 1.4.2 link download: https://drive.google.com/file/d/0B5MSGGCOoMjiTFE5RHlaOWFvOVE/view?usp=drivesdk

4. Copy to the folder where the Minimal ADB FASTBOOT was installed the TWRP OREO link download: https://drive.google.com/file/d/0B5MSGGCOoMjial94VHVzVnNVSGc/view?usp=drivesdk

5. download the rom MHA-AL00C00, unzip it and the dload folder that we have left to save it in the root of the SD link rom card: https://mega.nz/#!lYIhhDqY!I8lrCig3x2MMTHINZOvwVmhYDX2vz9QWb6V9epA6JI4

6. Download the file MHA-AL00C00.bin and save it in the root of the SD link card oeminfo: https://drive.google.com/file/d/0B5MSGGCOoMjiSUdZQmJQdzNIRUU/view?usp=drivesdk

DOWNGRADE PROCESS

1. Unlock the bootloader.

2. Enter the folder where you have installed the ADB Fastboot Minimal, press the shift key + right click and choose to open the command window here.

3. While in the command window we proceed to install the OREO TWRP with the following command: fastboot flash recovery_ramdisk twrp-oreo.img

4. Once the OREO TWRP is installed, we enter it with the button (volume up + power), the Huawei logo comes out and we release the power button.

5. Being in the TWRP we go to the option ADVANCE and in this we select the option TERMINAL where it opens a window to place the following commands which install the oeminfo saved in the SD the MHA-AL00C00.bin

cp /external_sd/MHA-AL00C00.bin /tmp/oeminfo.bin and they give the blue button of the keyboard to confirm it.

dd if = / tmp / oeminfo.bin of = / dev / block / sdd5 bs = 1048576 and they give you the blue button on the keyboard to confirm it.

After entering the two commands, we go back to the TWRP and look for the option to turn off.

7. With the phone completely turned off we proceed to install the ROM MHA-AL00C00 which is in the dload folder, press the three buttons at the same time (volume up + volume down + power) until the installation of this one.

If everything was done to the letter the phone should restart and turn on normally with the ROM MHA-AL00C00 installed, and after performing this process, you can re-perform the model and rom you want.

TIP: When doing the rebrand again for the change of ROM, perform the procedure twice selecting REBRAND so that the change of ROM can remain because once it is compiled in TEST KEYS NRD-900M, this I say as experience from someone who has already performed this procedure twice.

[YOUTUBE]https://www.youtube.com/watch?v=TtRD8g5n2_U#action=share[/YOUTUBE]

Link Video: https://www.youtube.com/watch?v=TtRD8g5n2_U#action=share

http://www.htcmania.com/showthread.php?t=1362900

Thanks to the creators of this method since without them this would not have been possible.