I had to go all the way back to 851(MR1) I tried MR3, but it could not see my sim card. Next I flashed MR3 but with Oreo 8.1 modem image. Sim worked all worked except I had no sound. System sounds and ringtones worked even dialing tones but when the caller answered, I could not hear them. No playback sound, YouTube, Spotify, ect. I did manage to have sound on Google Play Music in safe mode. So I flashed MR1 and so far all seems peachy even after OTA back to MR3. I can't decide if I want to try my luck with MR0(Oreo 8.1) again or stay here.With the factory images or am I stuck on O for good after updating