yea u need a firmware update, sorry i completely forgot about that :P

http://tdb.rpc1.org/original/1625BBEA.ZIP <-- cvt of 1625 firmware
http://dvdpro.club.st/firmware/BenQ/WinDWFlash.rar <- WinDWFlash

http://tdb.rpc1.org/original/640CES04.ZIP <-- thats the original 604c firmware, if you want to revert it