Hi

I recently got a k530i whose mic behaved oddly after a firmware upgrade. I thought the flash had went wrong so I decided to flash it again with the w660i firmware and all went well. But the problem with the mic is still here: I can hear people perfectly but sometimes they can't hear me. When I put the phone on handsfree mode and put it back to normal everything goes back to normal.

So is it a hardware problem, or is it a problem with the mics driver?