Modern game consoles are designed to detect the software hacks which would allow you to play downloaded games on them. There are only a few options and each one of them is detectable by XBox live.
Putting a nonstandard OS on your xbox in order to play these games will have your console permanently banned from XBox live. This will screw up your console any number of ways, including making it attempt to and fail to download updates every time you do just about anything, denying you the ability to have achievements of any kind, and screwing with your system memory in ways Microsoft will deny happen which lose you game data and saves you've spent hours upon hours of your life on.
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