Zest, It is called s1fwx and you can download it
HERE and there is a guide to using it
HERE . As long as the player is being recognised by the upgrade utility you do not need the adfu driver. If it dies completely and you need to short the memory chip to reset it then it should be recognised as an ADFU Server and windows will then install the driver from a copy in your windows directory, if it can't find it it should let you guide it to the AdfuUpdate.ini