richuurd, I tried almost everything but at the end couldn't get it working with my computer again.  I had tried various usb cables, changed computers, reinstalled usb drivers, etc.  Every other input was working except the USB.   I ended up returning my X1 and they replaced it with a new one...

My Aune X1 Pro mk2 started having the same USB problem as the OP also. Now I can't connect via USB anymore.  I've tried it on 3 different problems and all returned with the same error message.