I hope to add more to it soon but for now you can mod your XP with it.
all credits to Ccaveman84 Thank my friend sorry
Directions for use:
Extract your save to the desktop
Use With Hard Save (B and onwards) Auto save (Slot_A) Wont Work
Open your save with my mod tool
The tool will display your current XP total
Simply type the amount of XP you wish to have (Max 2530000)
Or Simply hit the Max XP button to max your player XP.
Re-Hash and Re-Sign
Then inject the save onto your USB memory Stick or directly on to your Xbox 360 hard drive.
If you max the XP it will jump you to level 23 (Max Level)
And you will have 22 upgrde points to spend