here is a Spec Ops The Line modded GPD file that has 999999999 XP on it.
i have tested it my myself and it works 100%
you will have to play a game and get one kill to get level 46.
how to use my gpd file
step 1 plug your flash drive in to your 360
step 2 then move your online profile to your flash drive
step 3 plug your flash drive in to your PC
step 4 then open the program Xbox 360 Tools Infinity
step 5 then drag your profile save to your desktop
step 6 then open your profile save with Xbox 360 Tools Infinity
step 7 then click on content tab and extract the gpd file to your desktop.
step 8 then open the gpd file with a hex editor program
step 9 then type your xp amount that you have in hex "example 2484 is 09B4 in hex"
step 10 one result will come up then type 3b9ac9ff that is 999999999 xp
step 11 then save the file and pot it back on your profile
step 12 then unplug your flash drive pot it in your 360 and move it back to your hard drive and that's it.
i am now taking requests if you won't your GPD file modded post it here by the way you have to have at lest 2000+ XP so i can mod it for you.
p.s. make a back up of your profile just in case