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Just got the tmobile android 12 update on my Oneplus 9pro global version and its causing issues
I have the global version of the one plus 9 pro and have always stuck to tmobile firmware cause I need wifi calling/texting. Just got the android 12 update today. Now my phone thinks its always charg...
Personally, I would update and if it isn't to your liking, downgrade by using your Global MSM Toolkit. These kits take you back to Android 11.
Here is a link to everything you need (including instructions). Just be sure to use the Global MSM and not the Indian/T-Mo/or EU version(s). Hope this helps!
https://drive.google.com/drive/folders/1PbVwsUqW8Zh1sJLgl4Uf-YMkzvr8PJt8
