logitech-usb-restore does not match Logitech flashing tool

[hughsie]

In logitech-usb-restore you seem to have:

for payload in payloads:
  response = dongle.send_command(0x21, 0x09, 0x0200, 0x0000, payload)
response = dongle.send_command(0x21, 0x09, 0x0200, 0x0000, payloads[0])

But the logitech tools only write the first packet once, at the end of the flashing process. I assume this is on the logic that if flashing fails the interrupt vector will be set at 0xffff and thus the bootloader does not start the runtime firmware. I think you probably should skip the first payload packet in the same way to avoid broken hardware if the flashing is interrupted.