To get in post GT and i will invite you
Once in:
Join, Leave then go into split screen and start the game hit the back button and:

[color=darkred]-Back button= Rank 55
Dpad Right= 0 prestige.
Right Stick= 1st prestige.
Left Bumper= 2nd prestige.
Y Button= 3rd prestige.
RT= 4th prestige.
LT= 5th prestige.
Left Stick= 6th prestige.
X Button= 7th prestige.
B Button= 8th prestige.
Dpad down= 9th prestige.
Dpad up= 10th prestige.
Dpad left= 11th prestige.
Look at the ground= Unlock all

Please post legit,thank topic,and rep if possible