at first you have to re install firmware using Odin without users data

use Google message app and setup RCS service

no bro i am using s10 and i have already switch one ui beta 2.0 to stable version and i have unlock it by login using Google account not using previous used password and it works just fine.so you can do one thing software repair using odin and start ...

yes need in built app lock .....

yeah go to the service centre and replace the camera module... as i did... and my problem has gone....