nitramcek , via OnePlus 7 Pro , Apr 20, 2020 : I downloaded OnePlus camera 4.0.213 from APK mirror and installed it. It looks like it's camera APK from OnePlus 8. Now I can't open camera any more. it's just black. I tried to install older APK bit it doesn't install, probably because it's older version then this that it's now installed. I installed whole Oxygen OS again but the camera didn't change back to old version. Strange that didn't work. I guess I'll have to factory reset the device or even go back to official ROM to erase everything (now I'm on beta). Does anyone have some idea what else could i do so I don't have to do all that?