I've been reading around and some people/places mention of patching the dumped NAOMI files, any idea of how to go around this? One used a 'patchv4.exe' that I can't find. I know that at offset 420 is the BIOS version check, FF = disabled.
yes denuan made a patcher for naomi GD Roms. there are also patchers for cart games, but these are individual patchers for specific carts. As well as the GDROM patcher there is one that allows the GD that is netbooted to be played on any region Naomi.