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I have had my bv6000 for 3 months Great phone at first but now when I make a call the other person can only hear a muffled voice making the phone unusable, does this mean I have to get the microphone replaced ? It appears to be easier to replace the whole usb charging board, regards Mark

Hi friend, thanks for getting in touch. Please go to the online shop where you bought your phone to get support, the shop will contact us directly.

I´m having the same problem from the beginning (Jan. 07)! The onlineshop (from aliexpress) is not willing to help and want´s to see "a video of the problem".

Since (in my case) the mic works with whatsapp-calls and sound-recorder i would guess it´s a software issue?! It´s currently on 20161011.

I´m having the same problem with mine from the beginning (Jan 2017)

I´m having the exact same problem from the beginning!

finally my messages are shown here! :-/

Same here... Still having clicking noises when taking Videos as well.

i have same problem. when a speaking with a other person my mic working very bad but when i record sounds it work very well

Hope this will help.
"To enter the engineers code go to phone and dial pad and enter the code.
*#9646633#
You are now in engineer mode with the top tab telephony.
swipe across until you get to hardware testing.
select audio
select volume
select voice
you will see the drop down menu for receiver, hac, headset, speaker.
select either receiver or speaker
manually change UL gain to say 240.
scroll down the screen and hit the button Set.
go back using < key.
then select voice again just to check the setting for UL gain has changed
then press home and test by ringing someone or receiving a call."

first try: it seems a little louder now but still muffled.
Can you please describe the other options (sidetone gain, DL gain Index[n]) for optimisation