Re: why is microphone not working since demin update on Nokia Lumia Icon
Nokia 928 with non-working secondary microphones. Still testing, but I suspect a software issue, not hardware.
The mics quit working shortly after upgrading to WP 8.1 DP. Prior to that, mics worked fine. Afterward: Cortana could not hear anything, speech to text could not hear anything, MS and Lumia Camera audio record only static.
On a whim, turned Cortana off, rebooted phone (as requested), and secondary mics work again.
However, first time use MS Camera to record video, only static. And mics stop working again.
Reboot seems to fix. Lumia Camera seems not to kill mics.
More testing.
WP: 8.1 Update - Denim
OS: 8.10.14219.341
Firmware: 3051.50009.1446.0093