Where are the USB Mic Array Firmware Binaries?

Where are the firmware binaries that are listed in the Update Firmware table?

@awilhite sorry, this document should be updated.

@Baozhu Why are the firmware images with the fixed gains removed? How can I achieve the same functionality without them?

https://github.com/respeaker/usb_4_mic_array @awilhite Please check the README documents.