[AC Question]

Nexus 5, Build MOB3OY. Phone: no-one can hear me. have done factory reset. undid the Phone updates which worked for about 8 hours. Also, when wifi on, Cellular network state is disconnected" and when wifi off, "cellular network state is connected (LTE)" but but I still can't be heard either way.. Switched to 3G but problem persisted. Any ideas what to do?

I want to move back to 6.0.0 but don't know how..

thanks, Monty