I Need Help With Hacking Modern warfare 2 Split Screen.

What I Have done is I Put mp data What was saved on my Xbox storage then I put in my Usb Device And Moved The mp Data Over to It. And Then I Put my usb stick into my Laptop.
Then Opened Up Modio Then Hit Open a save then usb stick Then Mw2 Mp Data And Then search Get Other Saves For this game Found a Mw2 split Screen One Downloaded it then saved it to my usb then put my usb stick back in my Xbox and started mw2 up and went to split screen and started it but it doesn't work ??