Hello, I have a problem with my 6800Pro for a few days: a window "the Google Play Services app has stopped" constantly appears and I have to press "reopen the app". I tried all the solutions recommended by android without success because I can not reinstall the app or remove the latest update. You can help me?

Hi there!
Please perform a factory reset from the recovery menu:
viewtopic.php?f=192&t=334922

A factory reset must be done after each firmware update to avoid weird issues like this