Update the USB Boot Key to DSM 4.2 (.img) then use Assistant to provide the new .pat to box, the update manager will let you select update/migrate or clean install.
Hi how update USB Boot Key to DSM 4.2 ? Do you have any files ? or manual
Pzdr
Mariusz
Maybe you have are ready image Boot Key 4.2 please share it
Pzdr
Mariusz