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Update a not well-known 8.1 (treble) android Chinese smartphone to 9.0

Hey there!
My name is Thomas and I'm new to this forum. I have a cheap Chinese phone: the UMIDIGI One Pro. It's a really good smartphone provided with stock Android 8.1.
It's been a few weeks since Android 9 came out and I think it's a very good version. I currently use Pear Launcher and Power Shade to have a close interface (I'm a fan of Pie one).
I like hacking and I had a little fun yesterday by rooting my phone with Magisk and installing the God's favorite language with Termux (RUBY <3). Just looking at examples of what I could do with Termux I saw that I could see if my phone supported Treble, and contrary to what I thought ... it is!
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I am a newbie so correct me if I say nonsense but I think it would allow me to update to android 9, right? I watched some tutorials but they use TWRP (and I have not found a version compatible with my phone because it is really little known and recent).
I am currently able to use:
- ADB & Fastboot
- Termux
- Magisk
- SP Flash Tools (I used it in order to install Magisk)
- The ROM folder downloaded from the website of my phone: [link blocked as I'm a new user]
But I'm not able to:
- Unlock bootloader (when I restart on fastboot and perform the command "fastboot oem unlock", it asks me to press volume up to confirm because it could void the warranty and then it says "unlock failed"
- Install TWRP (as I don't found any supported version)
Do you think I can update it to android 9? If yes, how?
Thank you very much for taking the time to read me. Sorry if my English is not very good (I'm french).
Thomas!

I found a compatible TWRP version here : [Link blocked because I don't have 10 posts]
So I installed it with SP Flash Tools. :good:

I also found a TWRP for the ONE PRO, but I have the ONE, you think it will work ?
And from what source did you get the boot.img to install Magisk ?

I have the One Pro it's the same phone except you have a bigger battery and I have wireless charging capabilities...... keep me posted because I might want to do the same

Miui 10 for mi4 chinese

Hi My Xiaomi MI4 recently has been showing notification of UPDATE available TO version MIUI 10. Should I update it ?
I've heard it doesn't change nothing at all. and beside it once you update to it, you can't downgrade to previously version.

tiagosarmento said:
Hi My Xiaomi MI4 recently has been showing notification of UPDATE available TO version MIUI 10. Should I update it ?
I've heard it doesn't change nothing at all. and beside it once you update to it, you can't downgrade to previously version.
Click to expand...
Click to collapse
It may slow down the phone. But it will also give new looks and better features. Also, there is always an option to downgrade if you can use your laptop and spend some time to install any custom rom. (Will also void the guarantee)

It's a good choice to update to MIUI 10.
tiagosarmento said:
Hi My Xiaomi MI4 recently has been showing notification of UPDATE available TO version MIUI 10. Should I update it ?
I've heard it doesn't change nothing at all. and beside it once you update to it, you can't downgrade to previously version.
Click to expand...
Click to collapse
I've tried the lastest version of MIUI for cancro(MIUI10 8.9.13) for nearly one year. Before Febuary, 2019, I tried the PixelExperience(based on Android 8.1) and its new features & mini size touched me(I can use my face to unlock by Google Smart Lock. And 16GB isn't enough nowadays). But finally I missed the convenient settings and stability of MIUI, and Android 6.0 can still running most of the apps.
Of course, I have deleted some useless system apps(for me) like Mi Video\Mi Game\Mi Browser. In this case, I installed MX Player and Via(also Google Webview Core). To make the ROM better, I also changed the theme(bar, lockscreen), fonts(changed to MiLanPro by an app[because Magisk doesn't work on this ROM]), launcher(with a good icon package) and wallpaper. It doesn't slow down the phone. Just try it!
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Downgrading note 20 ultra from android 11 to android 10 *Urgent*

Hello Everyone,
I recently purchased n986u1 but realized they have closed the option to unlock the bootloader after the recent patch.
2 days later I purchased an Exynos variant is shipped with android 12 and somehow managed to downgrade to android 11.
I'm a full-time oneplus/ iPhone user and was not aware of the binary issue on Samsung. Want to downgrade to android 10 doest matter if its custom ROM or anything else
Current software version-
Android 11
n985fxxs3dug9
Help will be highly appreciated
Very happy to donate something for future development.

The bootloader was updated so rolling back past 11 likely isn't possible.
The last new Samsung Note that shipped with Android 10 is the N10+. New ones are still for sale.
You can roll back to the same and a higher version than the bootloader/build number. That significant digit is the 5th from the end.
Here's how to read and interpret what you got.
Example, in this case it is 2, a N10+ running on Pie:
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blackhawk said:
The bootloader was updated so rolling back past 11 likely isn't possible.
The last new Samsung Note that shipped with Android 10 is the N10+. New ones are still for sale.
You can roll back to the same and a higher version than the bootloader/build number. That significant digit is the 5th from the end.
Here's how to read and interpret what you got.
Example, in this case it is 2, a N10+ running on Pie:
View attachment 5552843
Click to expand...
Click to collapse
cant even flash a samsung custom rom?

Checking SamFW there's Android 11 and Android 12 Samsung stock ROMs compatible with the lastest BL revision. Going back to Android 10 wouldn't change your bootloader version, regardless. There may be some method that I've missed, but it's unlikely that it will be worth the time/effort to get there.
You can flash Android 11 (As I did originally) since there's a version compatible with the BL revision, or flash Android 12.
Edit: If your goal is just to root the device, check out https://forum.xda-developers.com/t/...-dr-ketan-rom-i-oneui-4-0-i-oneui-3-1.4154487

Question Is It Possible to downgrade from Android 12 to 11?

Hello,
The same question as the title, is it possible to downgrade android version 12 to 11? I feel that it runs too badly on android 12 compared to its previous version.
I already tried via odin, from G996BXXU5CVDD (current OS 12 installed on my cell phone) to G996BXXU3AUIE (the latest version of Android 11 available from my carrier); but when "starting" the process, it fails and on my cell phone it appears as "sw rev check fail (bootloader) device 0x5 binary 0x3".
plz Help
Thanks!

Depends on the bootloader version.
The 5th digit of the rom must the same or higher than the bootloader's 5th significant number/letter, it can't be lower.
In this case that number is 2:
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blackhawk said:
Depends on the bootloader version.
The 5th digit of the rom must the same or higher than the bootloader's 5th significant number/letter, it can't be lower.
In this case that number is 2:
View attachment 5687605
Click to expand...
Click to collapse
ok, so I can´t go back D:!!!!!!!

Protosolid said:
ok, so I can´t go back D:!!!!!!!
Click to expand...
Click to collapse
Ouch.
If it was a OTA update you can as long as the bootloader wasn't upgraded too.
If it came loaded with 12 the bootloader probably is also upgraded.
This is one thing I hate about stock Samsung's.
My one N10+ came loaded with 10 and the other is still running on 9. I prefer Pie, it's more 3rd party app friendly and easier to troubleshoot.
So yeah, I feel your pain

Rip. Android 12 sucks, I reverted back to 11 after less than a day of use. 13 doesn't seem like it'll get much better either.

Update LG Wine Smart from Android 4 to 5 or 6?

Apologies for posting here but there is no forum for the LG Wine Smart (D486). Mine currently has stock 4.4.2 KitKat. Aw remember that? LG update app no longer functions correctly as it was shut down in 2020.
Is there any way to update this to 5 or preferably 6? There is an app I need that isn't compatible with Android 4.

You have to find
1. A Custom ROM suitable to phone ( specs: 1 GB RAM, 4 GB max storage )
2. If found, a Custom Recovery suitable to phone to flash the Custom ROM found

Many thanks. Sorry for the questions but if you were me, where would you look first?
Alternatively I wanted to make it clear that this phone officially shipped with Android 5.1 later in its life. I just happen to have an earlier 4.4.2 version. Where might I find the official 5.1 ROM and flash it?
Edit: I have found some options that I will try at http://lg-roms.com/lg-firmware/lg-h410/h41010d/2879

I'm not having any luck @jwoegerbauer . It turns out 4.4.2 was the latest official ROM for this phone.
Would you be able to assist a little? If you were me, where would you look first (as in URLs) to get a custom Android 6 ROM and recovery?
I'd like to update to Android 6 or higher. All the apps I want to install require Android 6+.
I'd just need to make sure it can recognise input from the LG Wine Smart D486 keypad.
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Thanks in advance!
P.S. Cute baby!

Aww, that's cute

XanderXDA said:
Aww, that's cute
Click to expand...
Click to collapse
The LG flip or the baby?

CJSnet said:
The LG flip or the baby?
Click to expand...
Click to collapse
Can I say both?