S1: subscribe too , [ Register or Signin to view external links. ]
S2: sent iBG x a message , and ill invite you
S3: go to split screen
S4: start with the checkered map.
S5: Select your prestige of these...
~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
~RB = Modded Stats

S6: go to xbl , go on live and get on kill , then you should unlock all.
S7: remember i will check if you sub!