@K3Nv2, The Dreamcast format is different to Windows executables. In this case, the main executable is "1ST_BOOT.BIN" and is either signed for a debug kit or retail console, and is usually scrambled.
I played all regions with either patching the games directly or a boot disk wasn't too hard even shrank some games to fit on normal CDRs lol that was a bit harder
Honestly kind of shocked I cannot run Killer Instinct Gold.... I don't think it's a hardware issue I think the emulator is well all 4 I tried wouldn't go