I am opening up this new message just to revive an existing message that is errantly marked as "Solved", even though the solution that is referenced clearly states that it is not solved. This problem centers around one of the two microphones within the Galaxy A12, mic 1 to be specific, that is no longer working. A growing number of people are saying the same thing has happened with them, which gives indication that something along the lines of a firmware upgrade or something of that nature is creating a problem. 

This is a link to the existing still-ongoing discussion concerning this problem, but which is errant...