I made Android 9 "fresh" installation for my XZ1C. After updated I have not used much XZ1C because I bought new phone reason of several problems with XZ1C. It seems that standby time is very good and there is no battery drain, thanks for Android 9. But now I found one major issue. When making phone call after pressing "call"-button the screen turns off and does not turn on during call. You cannot end the call because screen is off. After trying everything the screen suddenly turns on. What might be the reason. I was plan to sell XZ1C but I do not want to sell device which is not working normally.
By the way - OnePlus 6T is very excellent phone 
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