Are you sure you have unmounted the PCB from the hard disk? You get that message because your hd is "BSY", so the spin must be still connected... Anyway, i want to thank Gradius for his guide: yesterday i done the job!!! I had only to repeat a few times the procedure, because i got nothing (or same error) when launching the "U" command, but finally it worked and i saved my data and updated the firmware. Thank you again!!!!!