So Im having the same problem using flycast. I thought it might be the bios I found because I could not find the exact one used in the youtube video however I was able to find a naomi bios pack and tried all of them and nothing would work for me. I've double checked everything else to make sure I didn't mess up and all looks well. I have all the games (.bin / .lst) loaded with art work in launchbox but can't get them to play to save my life. But I wont stop trying there are some amazing games in that library I would love to try. Any Advice?