I have the same problem with a BV6000S that I bought in January. I tried to follow the steps to the enter in the engineering mode but nothing was improved. When I use the earphones, people ear me correctly, that means it comes from the micro phone.
Some help ?

My friend have the same trouble on my smartphone BS6000S. She bought it on Amazon and received it on january 2017. Every is OK except the microphone. When she speaks, people hardly ear her voice. I have tried to enter in engeneering mode and change the values of MIC but nothing has changed. Is there...