If the boot_rom_64b8.ic606 file is indeed inside the naomi.zip then probably the MD5 hash doesn't match with the version that DEmul is looking for. You should be able to find the correct version easily with a quick internet search.
Trying to run any of the 3 versions of Virtua Fighter 4 Final Tuned in DEmul gives this error:
Even after going into the Test Menu and checking the DIMM board test:
Any way to possibly resolve this issue?