However, the microphone does work again if I go to speaker-phone mode. So i know the Mic itself is working (sound recorder works also).
I think somehow the phone thinks a headset is plugged in and disable the mic unless I'm on speaker-phone mode.
I don't think it is a ROM issues as I have tried a large number of different ROMS, including flashing stock OPO image. None worked.
If anyone know a solution to this issue please help me out. It's very frustrating that I can't make phone calls and have to turn on speaker-phone or use a headset.