I am using a Respeaker Mic Array V2.0 with a Raspberry Pi loaded with Picroft, which was working very successfully (audio output is via the Respeaker). I was able to play music and then speak to Mycroft and my voice would be deteced. I recently rebuilt the pi with a fresh picroft install which automatically installed 1_channel_firmware.bin firmware. Since this happened the Respeaker will not detect my voice over the playing audio. I have re-installed the 6_channels_firmware.bin firmware but without success.
How can I revert the Respeaker to factory defaults?
Many thanks for any help.