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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

Question Worried I'm bricked. Please help

I'm getting desperate now.
MSM tools (EU/Global) get stuck at waiting for devices.
No ADB (unauthorised) or fastboot. In Windows device manager after holding power and both volume buttons for fastboot it's shows as this:
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"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
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"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
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This is what it looks like when using the button combo power and volume up:
I'm at a loss. Had to buy a new laptop and everything to fix it.
Please help, someone. It's getting depressing now.
Drivers are fine by the way. All upto date. Only ones I couldn't find were the official OnePlus ones, but those should be automatically downloaded after plugging in right?

! is a driver issue.
Unbrick OnePlus 9, 9 Pro Using EDL Firmware With MSM Download Tool
OnePlus has finally launched its OnePlus 8 series successor known as OnePlus 9 and 9 Pro with a much-upgraded camera, processor, display, refresh rate,
www.getdroidtips.com

Also, since your device is this far gone, it likely won't be recognized by the EU or global MSM Tools. Grab the Indian one for the 9 Pro.
lemonadep_22_I.07_210412.zip | by craznazn for OnePlus 9 Pro
Download GApps, Roms, Kernels, Themes, Firmware, and more. Free file hosting for all Android developers.
www.androidfilehost.com
After you flash that, grab 11.2.4.4 here and follow the instructions in the thread.
[Locked] Global 11.2.10.10 MSM Tool (added experimental support for Indian variant flashing as well)
This method is outdated. You must use this method or you will run into problems...
forum.xda-developers.com
If this doesn't work for you (make sure you try it with Sha256 checked and lite firehose unchecked), you will have to grab the downgrade package from the pinned post and either use the local upgrade tool or TWRP to flash it.

Thanks again for yesterday, mate. My hero for the day!

General [CLOSED][Q706F] P12 Pro global firmware got an update to android 12

{Mod edit: Link to 4pda removed and thread closed - Oswald Boelcke}
Spoiler
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f1tm0t said:
....
View attachment 5685907[/SPOILER]
Click to expand...
Click to collapse
How is the update, anny screenshot?

Ng Huy Viet said:
How is the update, anny screenshot?
Click to expand...
Click to collapse
Two ways:
* To wait for OTA update or try to get it trough VPN for other country.
* Download Lenovo Rescue and Smart Assistant and to make clean install via Rescue --> Rescue tablet.
Disclaimer: Works only for global stock firmware. If you have ROW on your tablet - you can do this; if you have ZUI now - don't make it, you tablet will broken and you will cry

What country should I set my VPN too?

Sorry, I don't know. I use ZUI on my tablet.

I just did a regular check for update and it worked here in the States. Thanks!

Guys I got the update yesterday and look how broken the taskbar is:
Anyone know how to fix it? I got android 11 backup from lolinet but I don't know how to flash it without twrp. Do I have to use the lenovo recovery software?

Just got the update, complete with the broken taskbar Really don't like the white and not happy it can't be changed unless you disable dark mode - which I normally use all the time. Can't be good for the OLED display to have a bright white taskbar permanently on the display.

Does anyone know how to flash my P12 Pro back to android 11? I downloaded the android 11 image from here but do I have to installed TWRP and unlock my bootloader to be able to install it? I really don't want to root unless I absolutely have to...
I downloaded the Rescue and Smart Assistant but the only image it will allow me to flash is the latest android 12L image...

You can flash any rom with OFil/QPST.
Roms are here: https://mirrors.lolinet.com/firmware/lenovo/Tab_P12_Pro/TB-Q706F/
Unlocking and rooting no need.

beerninja said:
Guys I got the update yesterday and look how broken the taskbar is:
Anyone know how to fix it? I got android 11 backup from lolinet but I don't know how to flash it without twrp. Do I have to use the lenovo recovery software?
Click to expand...
Click to collapse
Since i'm using gesture nav, i'm not suffering with this, but this sucks...

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:
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
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

Question Oneplus Nord 2T Bricked & no recovery and no fastboot ...!!!!

SO Yesterday i just had unlocked bootloader of my new oneplus nord 2t bcz i wanted to try new android 13 on itt ...!!
but later i found that there is no custom rom for it and later i found that i have got android 13 beta update on my nord 2t so in a hurry of this i just
directly tried relock bootloader due to which now i am getting that boot/recovery is corrupt pls flash new or go to customer care..
now in this i am not even able to go into fastboot ..
and recovery is there but no options and when i try to go into brom mode and try to bypass it I am not able to do it..!!
Now the main reason why bootrom or brom is not bypassed it is due to mediatek chipset ..
My mediatek chipset is MT6893Z which is not in payloads...!!!
Pl help me !!!
I am attaching photos!!
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Dear Sir/ Madam.
I am also same case,please help

You can't fix. You must bring it to service centre.
You used to be able to fix this by flashing stock ROM but now this is patched (yes patching apparently means making it worse for users according to OnePlus/Oppo)
The only way of fixing this issue now is by bringing it to a service centre, sorry for your troubles

I'm in the same situation after re-locking the bootloader from rooted device. Yesterday spent all day trying to fix it with flash tools. Got the A09,11 and 16 rom with proper scatter files, but phone won't stay on brom/edl so msm/sp flash tools will not detect it. Today I posted on oneplus forums, maybe you can reply with your problem too and then perhaps oneplus will provide a proper unbrick tool like for the rest of their phones. Here is the thread:
OnePlus Community
Introducing our new OnePlus Community experience, with a completely revamped structure, built from the ground-up.
community.oneplus.com

As garylawwd metioned, there is no fix as the mtk method was patched out on A.14 or A.15.
I guess it is very unlikely that OnePlus will provide an unbrick tool (;

Gents. Could you please elaborate more on what the OP did wrong in this case? How the bricking could be avoided in this particular case?
Does that mean that any re-lock of the bootloader and further OTA official update will lead into the bricking as of now?
Newbie here, still planning to root my phone (due to i need to enable auto-calls recording feature so badly), but according to many "bricking" forum topics, not sure if it is safe to go this way nowadays

You have to change the patched boot.img against the stock boot.img before re-locking your bootloader. Otherwise your device will be bricked and there is no way to unbrick it for now.