I have 4 or 5 copies of each of the games that work for soft modding. I bought them years ago when I was modding xboxs. I thought maybe I would lose or break some, and they were super cheap. Maybe I should try selling a few on ebay.
Error 5 means your hard drive isn't locked. If you're xbox is chipped properly, it shouldn't care about that. Are you sure it's not just soft modded?
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Your post says enigmah chipped. There is an enigmah video switcher, is there a modchip called enigmah too?