Forum Discussion
oneplus 9 pro authorised OxygenOS 13 gone
I downgraded my oneplus 9 pro to OOIS 12. After downgraded my device model was changed also some authorised app was gone like phone dailer,message.
So I wanna know that How can I get back T Mobile OOIS 13/12?
someone can please help me to find the outhorised OOIS 12/13?
you can install the OnePlus and Qualcomm USB drivers and using the MSM tool to get back to stock TMO firmware OS 11 then take the updates all the way to OS 14…….
Use this link and read EVERYTHING carefully and it will help you get to where you need to be!
https://xdaforums.com/t/op9pro-repository-of-msm-unbrick-tools-tmo-eu-glo-in.4272549/
might opt to get your info in the same place that walked you through downgrading back to 12. almost safe to say when you downgraded you downloaded a different variant of 12 that TMO doesnt use..if it did you wouldnt be having issues with the dialer etc.
