First of all you have to do the new SP2MP glitch released by killergaming:
https://www.se7ensins.com/forums/threads/gta-5-frozen-money-glitch.1722774/
After you have hit it, hit swap character and then you should be done from there. I'm pretty sure there's an error screen or something but once...
STEPS ARE BELOW THE BIG PARAGRAPH:
I was doing the give cars to friends glitch and when I was mixing a few steps up (I accepted invite from profile as I was going into the MOC) the game gave me a "This is a private session" screen and sent me back down into the bunker. When I'm in the bunker...