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How to revert back to stock if Mate 9 with Root

Hello, I don't find a way to upgrade my system from N to O. I have a rooted Mate 9 with TRWP installed and since I can't factory reset my device is there a way to put my phone back to stock?

read that pinned guide.
btw I rollback to 7.0 after 3 weeks of use, oreo just suck so bad....

Update my s7 edge from 6.0.1 to 8 and the signal doesn't work

Well, I had installed the android 6.0.1 but I decided to change it to android 8 for odin (a serious error) because now my s7 edge has no signal, I know this happens because the imei is altered, but to get it back I had made a backup in TWRP, the problem is that when changing rom the TWRP is deleted then try to install it as I had done before, the problem is that it does not work anymore, when installing TWRP for odin, and enter to resaurar my copy that had already fact shows storage in (0) mb and I can not restore it, when leaving TWRP it does not go beyond the samsumg logo and I have to flash the AP for odin of the android 8 that I have downloaded, now, I just want to go back to android 6.0.1 and have the device, as it was before, I know it was a novice error but I take your help, for TWRP I can not go back to 6.0.1 because I think TWRP does not have s7 edge support with android 8.
I translated this into Google Translate, sorry if there are parts that are not understood

i have an unlocked s7, so i guess that is what i can hope if i do the same, that makes me sad because i want android 8

Android Oreo on Honor 8

I have an Honor 8 phone, model RFD-L14, in the USA. Can I update to Android Oreo using HiSuite? If not, is there another safe way to do this?. I've search HiSuite and I can't find this update in there.

jlarysz said:
I have an Honor 8 phone, model RFD-L14, in the USA. Can I update to Android Oreo using HiSuite? If not, is there another safe way to do this?. I've search HiSuite and I can't find this update in there.
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Correction - Model is FRD-L14

Updates ( read: patches ) of an OS gets rolled out when manufacturer / carrier deems it necessary.
What you want to do is upgrade existing OS ( Android 6 ) to Android 8 ( Oreo ). This requires to flash a suitable Custom ROM, what requires a suitable Custom Recovery got flashed before, what requires phone's bootloader got unlocked before.

jwoegerbauer said:
Updates ( read: patches ) of an OS gets rolled out when manufacturer / carrier deems it necessary.
What you want to do is upgrade existing OS ( Android 6 ) to Android 8 ( Oreo ). This requires to flash a suitable Custom ROM, what requires a suitable Custom Recovery got flashed before, what requires phone's bootloader got unlocked before.
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Thanks. I read somewhere that HuaWei were rolling out Oreo on Honor 8 in Europe; I was hoping for here. The unlocking of the bootloader is expensive - the cost goes a fair way to buying a new phone. It seems risky too - I might end up buying a new phone anyway.

Android version downgrade

Hi, the current rom version of my Samsung S8+ is Android 9.0 G935FXXUCDUD1 to previous version
( And. 7 or 8) how can I return.

I would leave on 9 as it isn't vulnerable to some the nasty rootkits that can prey on earlier versions.

If you're really considering a downgrade, then it might be worth trying a full factory reset first (after backing up your data), since any downgrade will result in a data wipe anyway.

is your phone unlock? if no. u never do it

Thanks for the replies. The device is OEM unlocked, but according to my research, reverting to old versions is blocked by the manufacturer. But I'm wondering if there is a stock rom of previous versions for repair.

Question Q: What to do with ATT Snapdragon SM-S908 stuck on OneUI 5.0 beta 1? (Re-enable OTA)

Essentially I'm in a pickle and I'm currently running OneUI 5.0 beta 1 on my Samsung Galaxy S22 Ultra ATT locked device (SM-S908U) and I sideloaded the .bin for the official SMS908U beta build and it flashed and wiped everything and works fine. Except ONEUI 5 stable is coming out soon and I have tried Odin flashing several builds of Android 12 OneUI 4.1, I have tried Samsung Smart Switch emergency initialization (which doesn't show my device after failing to post the update), I went to Samsung Members but it says something about changed country info or not being in the Beta, but once I go to the open card to actually enroll for the beta, it says I'm already on it because it thinks since I have it at all its legit but it doesn't talk to the same exact framework of the app to find out if I need to officially enroll still. Either way I cannot opt out via Members either, I am fairly stuck. Any advice ?

*I do not have any backups from Android 12 stable.

You tried flashing official firmware for U device right? You were using CSC file or HOME_CSC to preserve data?
Going back from beta to stable means wiping data, phone will factory reset when you flash back the stable firmware and you should use the CSC file (not HOME_CSC)

Yeah... I know how to operate Odin3... It literally says right there I tried flashing multiple stable builds and each time it fails with AUTH error. Tried HOME and regular CSC....

I have the same phone. I have not gone back to stock U firmware from beta. But I have gone from beta to stock U1 firmware. I believe once you go back to stock U1 Android 12. You can flash back with Odin not patched to U firmware.

zlib1 said:
Essentially I'm in a pickle and I'm currently running OneUI 5.0 beta 1 on my Samsung Galaxy S22 Ultra ATT locked device (SM-S908U) and I sideloaded the .bin for the official SMS908U beta build and it flashed and wiped everything and works fine. Except ONEUI 5 stable is coming out soon and I have tried Odin flashing several builds of Android 12 OneUI 4.1, I have tried Samsung Smart Switch emergency initialization (which doesn't show my device after failing to post the update), I went to Samsung Members but it says something about changed country info or not being in the Beta, but once I go to the open card to actually enroll for the beta, it says I'm already on it because it thinks since I have it at all its legit but it doesn't talk to the same exact framework of the app to find out if I need to officially enroll still. Either way I cannot opt out via Members either, I am fairly stuck. Any advice ?
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Any chance you still have the flashing zip file for beta 1 s908?
The link for beta 1 in this post isn't working
If you do can you send it to me please?
Thanks