You just have to replace the encrypted roms with unencrypted roms (epr10806, 10807, 10808, 10809) and then replace the epoxy covered 68000 chip (unless you have one of the rare ones with the z80 as the epoxy block...then replace it instead).
Easy work if you have roms, a rom burner, and a 68000 chip sitting around. I have been waiting to get my hands on an alien syndrome board...if they happen to want to sell it rather than fix it let me know.