-Processor showing wrong is a known issue that OnePlus needs to fix. Just a visual bug, it's still the 888 chip.
-Since you just had the update give it some time to settle in and optimise itself. If you still have battery drain after that you can check out the unified battery thread here
https://forums.oneplus.com/threads/...heating-and-charging-feedback-thread.1412143/
-have you tried resetting your network settings?
-the last used app will stay open when you close all apps, that's how is now
View attachment 1758099
-does it not say OnePlus 9 pro under device name?
-for the camera app, and the device name if it doesn't show what phone it is, you can give feedback about those here
https://forums.oneplus.com/feedback/Click to expand...