I have this Baofeng UV-B6 (the same as B5), and after using CHIRP a few times, transmission stopped working. In fact, it starts transmitting, but no voice is sent whatsoever — dead carrier. RX works without any issues.
I tried with restoring default settings (CHIRP backup), by using "recovery" image, even resetting the radio to factory settings (menu + power on), and got no result. Still nothing.
It seems to me like the radio itself thinks that external mic is plugged in, so it overrides the built-in microphone. That's how I would've described the situation.
Anyone know how to fix this issue? More important — is it worth fixing it?
EDIT Here's the video tutorial on how to fix this issue (read the accepted answer): https://www.youtube.com/watch?v=7BrGo1-uW3k