[Guide] How to Downgrade M9 Pro Oreo Beta to Official Nougat - Huawei Mate 9 Pro Guides, News, & Discussion

In XDA-Developers every code builders finding solutions for Mate 9 but there is nothing for Mate 9 Pro (LON) versions.
I am opening this thread if someone give a hand to resolve downgrading problem Oreo Beta to Offical Nougat.
In Mate 9 forum @mankindtw build HWOTA 8 solution for MHA versions. Probably people will suggest me to use FunkyHuawei thing. But PayPal and BitCoin payment methods are not working in my country because of acredition at banking system.
So if any developer can support M9 Pro, it's too much appriciated for me.

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livevalue said:
In XDA-Developers every code builders finding solutions for Mate 9 but there is nothing for Mate 9 Pro (LON) versions.
I am opening this thread if someone give a hand to resolve downgrading problem Oreo Beta to Offical Nougat.
In Mate 9 forum @mankindtw build HWOTA 8 solution for MHA versions. Probably people will suggest me to use FunkyHuawei thing. But PayPal and BitCoin payment methods are not working in my country because of acredition at banking system.
So if any developer can support M9 Pro, it's too much appriciated for me.
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It's possible while you are in stock recover via Firmware Finder. Just you need to find which stock ROM works for your device. None of Rollback Roms worked with me.

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Yep! I'm also waiting for this! Hope a solution comes soon

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polaco95 said:
Yep! I'm also waiting for this! Hope a solution comes soon
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Probably @mankindtw preparing a solution. He made the old HWOTA system and nowadays keeps silence. It's my guess, waiting for the official ROM release date.

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@duraaraa I have a spesific problem. I'm using Huawei Mate 9 Pro. Bootloader unlocked, Oeminfo file belongs to orginal LON-AL00C00B225 but system running under Oreo 8.0.0.323 C636 log. It is sometimes running and sometimes don't.
I tried to downgrade Oreo to Nougat but it wasn't possible by Firmware Finder (special thanks to @gmanrainy for kind interest) or @mankindtw 's solutions. Probably file structure is different on Oreo, that could be reason for not downgrading.
Anyway, I know you are also moderating FunkyHuawei webpage. Is it possible for my situation to rebrand C636 and install LON-L29C636B235 version? Your payment methods not working in my country so I'l figure it out somehow. But I clearly wanted to learn if it is really work for me.

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livevalue said:
@duraaraa I have a spesific problem. I'm using Huawei Mate 9 Pro. Bootloader unlocked, Oeminfo file belongs to orginal LON-AL00C00B225 but system running under Oreo 8.0.0.323 C636 log. It is sometimes running and sometimes don't.
I tried to downgrade Oreo to Nougat but it wasn't possible by Firmware Finder (special thanks to @gmanrainy for kind interest) or @mankindtw 's solutions. Probably file structure is different on Oreo, that could be reason for not downgrading.
Anyway, I know you are also moderating FunkyHuawei webpage. Is it possible for my situation to rebrand C636 and install LON-L29C636B235 version? Your payment methods not working in my country so I'l figure it out somehow. But I clearly wanted to learn if it is really work for me.
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Yes, it's possible. But I would need to look into which package you need to install. You'd probably need to use FHRebrandTool to fix the branding correctly.

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duraaraa said:
Yes, it's possible. But I would need to look into which package you need to install. You'd probably need to use FHRebrandTool to fix the branding correctly.
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It's not problem to use it. I already downloaded tools but looking forward for your answer. Thank you.

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I successfully rebranded my phone to LON-L29C636 via your stock OEMINFO file. Now phone is in bootloop.
I am really wondering that is FunkyHuawei able to install B235 Nougat firmware. I'll share all details who are looking solution to downgrade Oreo to Nougat.

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livevalue said:
I successfully rebranded my phone to LON-L29C636 via your stock OEMINFO file. Now phone is in bootloop.
I am really wondering that is FunkyHuawei able to install B235 Nougat firmware. I'll share all details who are looking solution to downgrade Oreo to Nougat.
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You'd need to flash the Oreo firmware with FHUnbrickTool if it's not booting. Or you can re-unlock the bootloader. Probably issue is you used the tool with unlocked bootloader and a modified partition somewhere, I'm guessing.
You might also be able to use eRecovery method with Android O firmware. Downgrading to N will need to be done AFTER you have it booting in Android O.
I can't monitor this thread well, so you should email FH support if you need help.
EDIT: I apologize. I thought you were using FH tools. Apparently not. Yes, FH can fix your phone, to answer your question from before. There is no other solution for M9Pro right now.

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duraaraa said:
You'd need to flash the Oreo firmware with FHUnbrickTool if it's not booting. Or you can re-unlock the bootloader. Probably issue is you used the tool with unlocked bootloader and a modified partition somewhere, I'm guessing.
You might also be able to use eRecovery method with Android O firmware. Downgrading to N will need to be done AFTER you have it booting in Android O.
I can't monitor this thread well, so you should email FH support if you need help.
EDIT: I apologize. I thought you were using FH tools. Apparently not. Yes, FH can fix your phone, to answer your question from before. There is no other solution for M9Pro right now.
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I wrote an email on 23th but there is no answer from FHteam. Anyway my phone now is totally bricked. Opening in error mode. Error no 13 with no image. As you know I tried to downgrade from Oreo to Nougat.
Can we fix it and install the original Chinese edition on my phone? No problem if it would be Oreo or Nougat.
I'm going to try to buy credits from a different way, because PayPal is not working in my area.

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livevalue said:
I wrote an email on 23th but there is no answer from FHteam. Anyway my phone now is totally bricked. Opening in error mode. Error no 13 with no image. As you know I tried to downgrade from Oreo to Nougat.
Can we fix it and install the original Chinese edition on my phone? No problem if it would be Oreo or Nougat.
I'm going to try to buy credits from a different way, because PayPal is not working in my area.
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Please email again and mention that you are livevalue on xda.

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duraaraa said:
Please email again and mention that you are livevalue on xda.
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I sent again and mentioned again that I'm livevalue at xda.
Anyway thank you for your support.

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@duraaraa I want to thank FunkyHuawei team for responding very fast this time. We were online together.
I think my device hard bricked and I'll try everything to access fastboot mode. I always have bootloop and error mode continously. Key combinations don't work. Only power key, but it doesn't shuts down the phone, it always restarts. I was really expecting a downgrade solution from @mankindtw like he did for Mate 9 before. But he didn't and now device is hard bricked. Before an Oreo installation they need to warn people about there is no return.
No problem. I believe we will save my M9 Pro together. Thank you in advance and I'll stay in touch.

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livevalue said:
@duraaraa I want to thank FunkyHuawei team for responding very fast this time. We were online together.
I think my device hard bricked and I'll try everything to access fastboot mode. I always have bootloop and error mode continously. Key combinations don't work. Only power key, but it doesn't shuts down the phone, it always restarts. I was really expecting a downgrade solution from @mankindtw like he did for Mate 9 before. But he didn't and now device is hard bricked. Before an Oreo installation they need to warn people about there is no return.
No problem. I believe we will save my M9 Pro together. Thank you in advance and I'll stay in touch.
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if your phone can be detected by pc, it can be recovered don't lose hope

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mutahharbashir said:
if your phone can be detected by pc, it can be recovered don't lose hope
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I had neccesary testpoint and get board firmware. There is no problem anymore but anyway thank you in advance brother.

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I used Firmware Finder and it did the job. I downgraded from LON-L29C432B368 to LON-L29C432B229. You need to select FullOTA-MF-PV version.