in this directory must reside at least one BIOS image:
SCPH1000.BIN
SCPH5000.BIN
SCPH5500.BIN
DTLH3000.BIN

if You don't have any of them, go to ConsoleHack (link on my page) and dl it
if You have other image than listed You can name it as one of them and mail
me it or mail it to ConsoleHack.