using the -NOCHECK parameter, TSDNWIN overrides all hardware and firmware compatibility checks. Flashing the wrong firmware that way will kill the drive. That said, crossflashing and overriding security mechanisms is only for those who know what they are doing. I expect these to have at least basic knowledge of cmd usage.
For RPC1 conversion, get stock firmware from your computer manufacturer and see if it can be modified (see FAQ for details). For flashing modified stock firmware, no override mechanism is needed.