Try to downgrade, if fuploader still regognise the machine.
I would disconnect it from the processor especialy the comms and try uppgrade again and again

My stuff G98DH, G68J, DSP5200 ,DSP5200HC, DSP3100 HD621,AC11 , REL Stadium 3 Squeezebox Touch, Pioner BDP-LX71 ,Humax CXHD 5000C