Originally posted by zVirus
Wait you mean do the leaderboard/lobby switching while I'm on 1.13? Does that work?
You must be on 1.02 and your friend must be on 1.13 and invite you...then follow this steps and it work for me:
12.) Get a friend to invite you to a Player Match and then go to Playercard>Leaderboards then click right and hover over Just Show Me the Leaderboards Already
13.) Get your friend to switch it to Combat Training and then click X and then click O until you are back at your Playercard.
14.) Click Prestige Mode ONE TIME (I cannot stress that enough, if you prestige right there you will need to get to 50 in Combat Training again)
15.) Get your friend to switch back to Player Match and then enter Prestige Mode.
16.) Repeat steps 13-15 until you reach your desired prestige. Once you get there, I recommend going into a pre-game lobby to make sure you prestige sticks (or else it might bring you back one prestige after you quit the game)
Thanks to redsoxfan95