Got mine working as well, which is a Rev-2. If anyone else stumbles on this:
For Rev-2 there is a button on the PCB to do a hardware reset. Press it with the USB plugged in.
Then flash the latest firmware.
Then use the datalooper config to upload the default config. It needs to be a Chrome/Chromium browser. (I forgot that last part, it had been so long since I used it)