If I understood well, you've got a selfboot version of Guilty Gear X ? If so, you MUST have an ip.bin. Maybe it's hidden. Use one of my tools to extract it :
http://members.lycos.co.uk/megalexxx/
You should manage to do it alone.
But I'm not sure you'll manage to do something with it. If your game doesn't work, it should come from something else. I don't see the point of selling a non working game...