I'm confused...Are you talking about DEVELOPING on the Xbox360 or outright modding it?
You will never have the capability to develop on the Xbox360 with CryEngine without a commercial license, and a Microsoft Developer's console.
If you are just talking about console modding, try this
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Wrong forum, no replies to post from OP, OP has not logged on for a fortnight. And it has little relevance to CryDev.