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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

Help Oneplus 8T QUALCOMM CrashDump Mode

Hi friends ....
I have oneplus 8T KB2000 , when Flash Global ROM for this phone
use MSMTOOL kebab_15_O.12_201110
after flash ROM reboot dispay QUALCOMM CrashDump Mode
now , only entered to fastboot mode . EDL mode,
try Unbrick MSMtool other version kebab_15_O.12_210201 cant solve this problen also
there are of images in attachment of similar.
thank you in advance
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I saw this on the OnePlus Community site: https://forums.oneplus.com/threads/crash-dump-mode-phone-issue-op8t.1417674/#post-23065587

hello i have same issue, did you solve it ?

[OP8T][OOS KB05AA/BA/DA] Unbrick tool to restore your device to OxygenOS
Disclaimer: By attempting any of the processes listed in this thread you accept full responsibility for your actions. I will not be held responsible if your device stops working, catches fire, or turns into a hipster and claims to have been...
forum.xda-developers.com

I'm sorry if this isn't the right place to post this. Does anybody know of how to bypass settings keys for adb. I have a OnePlus 8t T-Mobile that I had unlocked by T-Mobile but still converted to global and since then has been nothing but problems.
Currently I have lineage installed and phone boots fine. The problem is that even though it boots I think it's still bricked. I have no touch once lineage boots... On top of that I have no recovery, I have no fastboot and no edl and adb needs the keys set to do anything with adb.
I've had numerous other OnePlus phones and never experienced issues like this. My guess is converting to the 9r lemonade broke something. Since porting that rom I have been unable to convert back to TMobile. I know my drivers are installed correctly. I not only know how to check drivers but I also tested drivers since I have 2 computers and also a 6t and a 7t to test. Msm tool fails since converting device.
Any ideas or leads on where to look and read is much appreciated. Thanks Sam

Smatteoli33 said:
Any ideas or leads on where to look and read is much appreciated. Thanks Sam
Click to expand...
Click to collapse
[Closed] [PORT] OnePlus 9R Oxygen OS Port For OnePlus 8T
┤Mod Edit├┤Project archived├ FAQ: •OTA support is there. •No Bugs. Improvements: •Smoother Than Stock OOS of 8T •Richtap Haptics. •Updated Stock Kernel. •Updated Blobs. •Updated Modem. •Updated CAF+ARM Patches. Instructions To Flash: •Same...
forum.xda-developers.com

Question Help returning T Mobile Oneplus 9 to out of box settings

Hello all.
I have a Oneplus 9 T Mobile variant that my son and his friend tried to install a Global Rom and I would like to return it back to stock. Problem is they lost track of what they did and now I do not know which way to go. I've read many threads and tried to educate my old ass before reaching out to you all. I used to be tech savvy but have been out of the game for far too long to remember most of the tricks. I would really appreciate it if someone can patiently guide me. I like to thank you in advance.
What I got out of them is they used THIS thread as a guide and magisk to root. They never backed up the stock rom and may have only flashed Slot_a. They uninstalled root to see if that helped. The phone works but can't update due to the unlocked bootloader that is greyed out. This is some info
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Just would like to get it back to stock just where it was when I received it new. Thank you again.
Wayne

Index of /list/Unbrick_Tools
Find the msm tool for your variant. It's here. Hold all 3 buttons,vol+& vol - plus power . This reboots edl and allows you to start msm tool. It restores to factory condition and locks the bootloader. Google msm tool for op9 to find out how to use properly.

Index of /list/Unbrick_Tools/OnePlus_9/T-Mobile_LE54CB/R (11)
This the one bud. And good luck

It worked! That was way too easy.
Thank you so very much my friend. I really do appreciate it.

wiona said:
It worked! That was way too easy.
Thank you so very much my friend. I really do appreciate it.
Click to expand...
Click to collapse
And btw the device will update properly with just the bl unlocked. It's when you get into rooting and patching partitions that Google -ota runs a checksum on the partitions ,detects tampered and update fails. Enjoy your device

How to roll back from OxygenOS 12 to 11!

Unable to roll back from 12 to 11.
Tried various methods. The local upgrade method doesn't work at all. Gives the following message:
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My OP7Pro is GM1913.
And current build version is: GM1913_11_H.31
And I really want to avoid the MSM tool option as it's a bit complicated.
Any suggestions?
Thanks.

alisiddiqui said:
Unable to roll back from 12 to 11.
Tried various methods. The local upgrade method doesn't work at all. Gives the following message:
View attachment 5751039
My OP7Pro is GM1913.
And current build version is: GM1913_11_H.31
And I really want to avoid the MSM tool option as it's a bit complicated.
Any suggestions?
Thanks.
Click to expand...
Click to collapse
Hello,
All informations for rollback are here bellow :
OnePlus Community
Introducing our new OnePlus Community experience, with a completely revamped structure, built from the ground-up.
community.oneplus.com

khalisz said:
Hello,
All informations for rollback are here bellow :
OnePlus Community
Introducing our new OnePlus Community experience, with a completely revamped structure, built from the ground-up.
community.oneplus.com
Click to expand...
Click to collapse
Yeah this method isn't working.
That's what the whole post is about.

Try to use msm tool to roolback

alisiddiqui said:
Unable to roll back from 12 to 11.
Tried various methods. The local upgrade method doesn't work at all. Gives the following message:
View attachment 5751039
My OP7Pro is GM1913.
And current build version is: GM1913_11_H.31
And I really want to avoid the MSM tool option as it's a bit complicated.
Any suggestions?
Thanks.
Click to expand...
Click to collapse
Hello sir, may i ask if you still have the zip file for this global update? the last update is a disaster. thank you

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?