Have you tried updating the firmware on the Headset? This can be done through the Bose app.
Does the issue persist only on Zoom or on other apps?
Does the issue persist on other devices such a mobile phone?
Please follow the troubleshooting steps below and see if that fixes it
- Turn off the headset and wait 30 seconds
- Plug the headset into a wall outlet using a USB charger, then wait 5 seconds
- Unplug the USB cord from the headset and wait 1 minute
- Turn on the headset
If after all that the issue with the microphone is not resolved, you most likely will need to either service it (if within warranty) or attempt to replace the microphone yourself.
Replacing the microphone yourself might be a very difficult task since the microphone is soldered on the logic board and it’s a MEMS microphone, a very small device.
Bose does not give out schematics or part information for their devices, so finding the right replacement part will prove difficult. If you find it, you will have to desolder the old microphone and solder the new one without damaging any other logic board components.