People aren't coming up with anything. Here is what everyone is trying to say. It's been tried and tested but at the end of the day the testers came up wanting. The way the 360 executes it doesn't matter whether you replace a demo with a full game or if you just burn the full game onto the disc. The xbox security simply does not let things like this happen. Each xex is checked for it's digital signature and media flag regardless of whether it was the 1st 2nd or 48,000th. Now, what you are stating is there could be a hole or flaw in the security to allow this code to run whose signatures normally would cause it to fail to run. That would be entirely possible if you were introducing something different that could mess with the way the security functions.. but you aren't. It has even been tested to see if it might work. It did not. There is nothing left to discuss here. Instead of investing more time into this idea that has been proven wrong, why don't you spend more time looking for new, valid possibilities?