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Start in Theate - invite your friend.
Rapidly swap theatre to player match until friend black screens ( he counts to 1-2 and then says stop)
You stop after he counts 1-2 seconds of being black screen you stop and you should be in a party by yourself - if you're not you did it wrong. Try again.
If he's gone, it should come with an error, Click "A" then a circle load will pop up: Tap "B".
Quickly go to Local, Solo or whatever it is - Create class, hover over a gold camo.
Gives you error code: Click "A". You'll be in Player Match. Swap to Private. Modify your custom classes to what you want - then load up Private game and end it right away. Get your friend to invite you to a player match lobby - start up the game and get 1 kill and 1 death. Back out or finish the round. You now have your custom classes that you made, even with guns you can't obtain - or camos.