This is a tut on how to patch new games to work without showing the update message.

You'll need to download these two programs
XexTool - [ Register or Signin to view external links. ]
Hex Workshop - [ Register or Signin to view external links. ]

First open your xex in Hex Workshop and search for hex string: "2031510020315100" with Find All Instances enabled.
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You should have two results showing, replace both of them with: "2031510020000000.

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Now run though xextool with the command: "xextool -r a -e d -c u xexfile.xex"
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The game will now run without update message, I've only tried with one game but should work with all.

credit to Oscar from xboxmb.