Guide to rollback huawei p10 from oreo to nougat

[txonan]

Hi,(I am spanish sorry about my english)
after a long time searching how to rollback finally I have found the way thanking to this thread https://forum.xda-developers.com/p10/how-to/success-downgrade-oreo-to-nougat-t3729659.
In the thread the way to rollback isn't very extended explained so i decided to create mine and explain easy.
My phone is a Huawei P10 L29c432B.... .
Steps:
1- Download HWOTA8 from--https://drive.google.com/file/d/0B2D9GdWntw69U3N2aDEzZjY2S1E/view
2-Download Firmare L29C900B217 or L09C900B217 depending your model (only are 2 downloads) fromhttp://pro-teammt.ru/firmware-database/?firmware_model=VTR-L29c900&firmware_page=0
3-Delete the row "echo - - update_package...... update_data public. zip..." from the file "META-INF>com>google>android>update-binary" from hwota8_update.zip from the downloaded folder HWOTA8.
4. Create HWOTA8 folder and copy the following files: hwota8_update and MHA_RECOVERY8_NoCheck.img (from HWOTA8 folder), and the downloaded firmware files. After copu the firmware files you have to rename them one has to be named "update.zip" and the other one "update_all_hw.zip" (don't write.zip extension).

5- Now you have to rewrite the recovery with twrp, for that you have to go to fastbood (VOL- and Power) mode and connect to the pc. Then go to Uncompresed HWOTA8 folder and run "Replace_Recovery.bat" after that you will have the recovery TWRP installed.
6- Finally you have to to go to recovery pressing VOL+ and power button then go to Install adn search sd_external and inside HWOTA8 folder from sd card install "hwota8_update.zip". The device will resboot and start installing the nougat rom, but after that you will have to rebrand to L29c432.... to unlock all the functions.

That's all now you will have your device rollbacked from Oreo to Nougat.

 

[stefan.irmen]

Hi!
Thx for this guid, it seems to be clearly and good to understand! I have only one problem: i can not find the row "echo - - update_package...... update_data public. zip..." from the file "META-INF>com>google>android>update-binary" from hwota8_update.zip from the downloaded folder HWOTA8 for changing... ???
I tried with notepad++, but i can not do this... How did you get this step working?
Thx a lot!

 

[Soenisti]

Hi!
Thx for this guid, it seems to be clearly and good to understand! I have only one problem: i can not find the row "echo - - update_package...... update_data public. zip..." from the file "META-INF>com>google>android>update-binary" from hwota8_update.zip from the downloaded folder HWOTA8 for changing...
I tried with notepad++, but i can not do this... How did you get this step working?
Thx a lot!

You have to unzip the hwota8_update.zip file into another location, edit the extracted update_binary file and then repack the zip. The update_binary file in HWOTA8_<date>.zip is a binary file and shouldn't be edited with a text editor.

 

[pale1505]

Hi,(I am spanish sorry about my english)

5- Now you have to rewrite the recovery with twrp, for that you have to go to fastbood (VOL- and Power) mode and connect to the pc. Then go to Uncompresed HWOTA8 folder and run "Replace_Recovery.bat" after that you will have the recovery TWRP installed.
6- Finally you have to to go to recovery pressing VOL+ and power button then go to Install adn search sd_external and inside HWOTA8 folder from sd card install "hwota8_update.zip". The device will resboot and start installing the nougat rom, but after that you will have to rebrand to L29c432.... to unlock all the functions.

That's all now you will have your device rollbacked from Oreo to Nougat.

hi there guys, i'm having problems with step number 5, i do rewrite twrp with that command, everything seems ok, have no errors, but can't go ionto TWRP like it isn't installed.
i can't run TWRP, can you please help?

 

[stefan.irmen]

hi there guys, i'm having problems with step number 5, i do rewrite twrp with that command, everything seems ok, have no errors, but can't go ionto TWRP like it isn't installed.
i can't run TWRP, can you please help?

First few times i had the same problem...
When the phone is off an you will hold "Power" and "Volume+" button to boot into TWRP, just hold "Volume+" after phone is vibrating... Then you will boot into TWRP...

 

[txonan]

First few times i had the same problem...
When the phone is off an you will hold "Power" and "Volume+" button to boot into TWRP, just hold "Volume+" after phone is vibrating... Then you will boot into TWRP...

You have to reinstall twrp and then continue with the steps.

 

[txonan]

hi there guys, i'm having problems with step number 5, i do rewrite twrp with that command, everything seems ok, have no errors, but can't go ionto TWRP like it isn't installed.
i can't run TWRP, can you please help?

The fact is that the recovery proccess is a **** in this model. Try to power completely off the phone and the Pess POWER + VOL+ when you feel the phone vibrates retire the press of power button and still pressing VOL+ button by this way sometime it goes ok. If TWRP load go ahead with the followings steps.

Other way it to reinstall again TWRP untill it loads.

Let me know if you suceed, good luck.

 

[Brandy20]

4. Create HWOTA8 folder and copy the following files: hwota8_update and MHA_RECOVERY8_NoCheck.img (from HWOTA8 folder), and the downloaded firmware files. After copu the firmware files you have to rename them one has to be named "update.zip" and the other one "update_all_hw.zip" (don't write.zip extension).

2. Download Firmare L29C900B217 or L09C900B217 depending your model (only are 2 downloads) fromhttp://pro-teammt.ru/firmware-database/?firmware_model=VTR-L29c900&firmware_page=0

non-functional link?
How exactly is it to be?

 

[pale1505]

The fact is that the recovery proccess is a **** in this model. Try to power completely off the phone and the Pess POWER + VOL+ when you feel the phone vibrates retire the press of power button and still pressing VOL+ button by this way sometime it goes ok. If TWRP load go ahead with the followings steps.

Other way it to reinstall again TWRP untill it loads.

Let me know if you suceed, good luck.

just to let you know that nothing worked,
went to a shop, they tried everything, uploaded older firmwares, but after that the phone died, only black screen, couldn't even switch it on.
warranty did the trick
the guys replaced the mainboard, nothing else helped

so i'm waiting now for the official update

 

[dmmercado23]

Good day! Can I use this method for installing Official Oreo from Beta? What I would like to do, is skip the deleting of row then just flash the twrp and continue with installation process.

 

[pdbc]

I'm on VTR-L29C636B361.

I would like to rollback to Nougat, for root reasons. I'm trying to follow this method, but I'm not able to find the right files. All I succeded to find is the "update.zip", from Firmware Finder website, but no signs regarding others mentioned ("update_all_hw.zip"). Where can I dowload the right files?

Moreover: I flashed TWRP 3.2.1. I would like to go back on stock recovery, but again I'm facing a lot of problems. I would like to extract from update.app I have (from "update.zip" above mentioned), but HuaweiUpdateExtractor gives me a lot of error. Any help?

Thanks!

 

[_Nostromo_]

I'm on VTR-L29C636B361.

I would like to rollback to Nougat, for root reasons. I'm trying to follow this method, but I'm not able to find the right files. All I succeded to find is the "update.zip", from Firmware Finder website, but no signs regarding others mentioned ("update_all_hw.zip"). Where can I dowload the right files?

Moreover: I flashed TWRP 3.2.1. I would like to go back on stock recovery, but again I'm facing a lot of problems. I would like to extract from update.app I have (from "update.zip" above mentioned), but HuaweiUpdateExtractor gives me a lot of error. Any help?

Thanks!

At the HWFF website the link leads you to you need to click the "filelist" (not only the "update"), that will give you links to all the files needed.
For the rest I am not sure, would also like to get back to the stock recovery but so far found no way to do so...

 

[pdbc]

At the HWFF website the link leads you to you need to click the "filelist" (not only the "update"), that will give you links to all the files needed.
For the rest I am not sure, would also like to get back to the stock recovery but so far found no way to do so...

I can give you recovery.img and recovery2.img for VTR-L29C636B162. I flashed this and then roll back to Nougat (B172) with FF.

 

[_Nostromo_]

I can give you recovery.img and recovery2.img for VTR-L29C636B162. I flashed this and then roll back to Nougat (B172) with FF.

Thanks a lot for your offer, however unfortunately my model is VTR-L09 so I better do not mess it even more...

 

[theonlykamph]

how do i edit update-binary? Just odd things comes up with notepad++

 

[Migue26]

Question

Hi,(I am spanish sorry about my english)
after a long time searching how to rollback finally I have found the way thanking to this thread https://forum.xda-developers.com/p10/how-to/success-downgrade-oreo-to-nougat-t3729659.
In the thread the way to rollback isn't very extended explained so i decided to create mine and explain easy.
My phone is a Huawei P10 L29c432B.... .
Steps:
1- Download HWOTA8 from--https://drive.google.com/file/d/0B2D9GdWntw69U3N2aDEzZjY2S1E/view
2-Download Firmare L29C900B217 or L09C900B217 depending your model (only are 2 downloads) fromhttp://pro-teammt.ru/firmware-database/?firmware_model=VTR-L29c900&firmware_page=0
3-Delete the row "echo - - update_package...... update_data public. zip..." from the file "META-INF>com>google>android>update-binary" from hwota8_update.zip from the downloaded folder HWOTA8.
4. Create HWOTA8 folder and copy the following files: hwota8_update and MHA_RECOVERY8_NoCheck.img (from HWOTA8 folder), and the downloaded firmware files. After copu the firmware files you have to rename them one has to be named "update.zip" and the other one "update_all_hw.zip" (don't write.zip extension).

5- Now you have to rewrite the recovery with twrp, for that you have to go to fastbood (VOL- and Power) mode and connect to the pc. Then go to Uncompresed HWOTA8 folder and run "Replace_Recovery.bat" after that you will have the recovery TWRP installed.
6- Finally you have to to go to recovery pressing VOL+ and power button then go to Install adn search sd_external and inside HWOTA8 folder from sd card install "hwota8_update.zip". The device will resboot and start installing the nougat rom, but after that you will have to rebrand to L29c432.... to unlock all the functions.

That's all now you will have your device rollbacked from Oreo to Nougat.

Hi, I have one question

Your phone was VTR-L29 C432 and you used the firmware of VTR-L29 C900, so can I use the C900 in any version to rollback and after that, what would be my version? C432 or C900?

I'm asking because for some reason I have VTR-L09 8.0.0.046(04VT) and I want to rollback, then rebrand and finally upgrade to VTR-L29 C432 with a custom kernel.
Thanks a lot!

 

[Wasabules]

This guide realy work ??

 

[dukenuken]

hello, I test by cons I have a problem, once flash hwota8_update.zip, it tries to restart in recovery and redémre on oreo, a solution?

 

[dukenuken]

Hello, I have a problem in the rocovery that I flash wota8_update.zip I have E: unknown command [errno]
Updater process ended with ERROR: 9
Error installing zip file '/external_sd/HWOTA8/update.zip

 

[muhammadsyafiq]

Maybe this is a silly question. Do we need to change the recovery file since MHA is a code name for MATE 9. P10 use VTR. Is it still usable?