LASO completion problem? (maybe not real problem)

A friend and I were playing the Halo: CE LASO playlist. We got to The Library and were stuck on it for 3 1/2 hours. I decided to leave and do The Library on my own and I managed to beat it in 30 minutes. We started Two Betrayals afterwards because I was going to recover his account and beat TL for him later. We didn’t play long because we knew it would take long and were tired. I recovered his account later, went to the Playlist and it realized it doesn’t start him at The Library. It skipped TL, and put him directly on Two Betrayals. I can’t go back and choose The Library so I can do it for him quickly. Does anyone have any idea what is going on?

EDIT: Also, my friend instantly crashes when he loads the Halo 2 LASO playlist.

We cannot help you with things that involve breaking Xbox Live Terms of Service. In this case, you are breaking ToS by recovering your friend’s account and playing for them.