problem with HTC ONE SV microphone

[htconesv]

Dear firends,
My HTC ONE SV has serious problem with its microphone, when use its speaker and even normal talk through conversation, mic doesn't work and full of noise,
but mic in voice recorder software is good. I think this is because of a software problem.
I update its android version to 4.1.2 immediately after purchase, may be its update cause it,
although I FACTORY reset it but problem not solved, I fastboot, unlock anl load a recovery but not solved.
please help me to downgrade it or how to solve it.
Thanks.

 

[djreevo]

i also have bottom mic problems, after updating to 4.1.2 and performing a screen replacement.

the bottom mic does not work in calls and when using sound recorder, only works when on loud speaker which i assume uses the top mic.

ive read about performing factory restores etc, but still no luck. ppl have said to root the phone and go back to a previous version. but im not confident in doing that atm

hopefully someone can help