refresh rate problem Oneplus 8 Oxygen OS 13
I wanted to ask is anyone else have problems using high refresh rate on their T- mobile OnePlus 8? Specifically for me the phone does not allow multiple apps to run at high refresh rate and even makes some apps run at a choppy 60hz, such as Google maps. And if so, has anyone discovered a fix Specs - T-Mobile OnePlus 8, Oxygen OS 13.0, Jun 5 security update 
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?
