low in call volume

Hello all, A week ago I did a FOTA update to 6.5.5 Beta (MIUI 7.4) but with this version I began to have issues with the microphone gain! When recording movies the sound is clear, but with WhatsApp, the voice recorder and phonecalls the volume is very low. Unless I turn on speakerphone, the...

Hi guys I've got a very annoying problem, the volume of the internal speaker, it's very low. When I call someone it's very difficult to understand what the people I'm calling says. I'm using MIUI 8 weekly 6.7.11 ( our last release for our phone) The phone is unlocked trough the official unlock...