Use a cable to connect device to your Mac. Hold buttons as needed to enter DFU Mode. First run ./ipwndfu -p to exploit the device. Repeat the process if it fails, it is not reliable. Run ./ipwndfu ...
The ReSpeaker USB 4 Mic Array is the successor of the ReSpeaker USB 6+1 Mic Array. It has better built-in audio processing algorithms than the 6+1 Mic Array, so it has better audio recording quality, ...