Loud speaker stopped working

The loud speaker has stopped working. cannot hear the phone ring... battery seems to drain faster..  How do I roll back to android 7.0

Loud speaker stopped working

user1514118439624 user1514118439624
 /  edited March 22

The loud speaker has stopped working. cannot hear the phone ring...


battery seems to drain faster.. 


How do I roll back to android 7.0

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