There is no way to load a firmware in any other way than from an USB stick, right?
I got one SQ5 in, that does not detect USB stick (tried many, none is detected and all of them work on a different SQ desk). Swapped the HP/USB PCB, no luck - obviously the USB port on the mainboard is gone. The only use for USB on that console would be FW upgrade, nothing else is necessary, but I guess there is no any workaround for FW loading, like TFTP or similar? Maybe a JTAG connection inside the desk?