Ok to get to to beast 11th prestige your going to need to the following things.
1.A patch that can make you 11th
2.Comgenie's File Manager
[1]Ok to become 11th your going to need your patch. To put this patch on to your Ps3 simply put the patch on the root of your usb.
[2]Then your going to go onto your PS3.
[3]When you are on your PS3 go to Comgenie's Awesome File manager
[4]Ok now that you are in the file manager go to devhdd0/game/BLUS30377/USRDIR/ In this place their should be 6 files. The EBOOT.BIN, default.self, default_mp.self, dlc1_ui_mp.ff, dlc2_ui_mp.ff, and the patch_mp.ff. You are going to delete the default_mp.self
[5]Now on the top right side of your screen their should be something that says dev_usb001. click on it and you should have your modded patch their.
[6]Now press the O button to copy the modded patch to your Left side.
[7] Exit out of File Manager and go to MW2.
[8]Start up a private match and pick the Become 11th prestige option.
[9] Congratz you are now 11th but you can not play in a public match to play in a public match simply quit Mw2 and Delete the MW2 Update that is under Game Data Utility.
I hope this tut helps people.