I know this have been posted like, 100 times. But it seems like everyone is "ah nvm this now, they nerfed it". But you can still pull it off with ease. Actually, my friend managed to do this just 2 days ago.
You know the first step
Lose team rating with alts until it gets very low, win alot with main. = Boost personal rating.
K, that far its just simple. They have not changed that fact yet.
So last patch they forced you to have 1850/2000 + TEAM rating also.
So? Pay a random or ask a friend to invite you to his well-rated team. Right click in the vendor window. Leave team.
(Of course dont switch from the team you have your personal in)
This must be too simple to have gone unnoticed, but I still see ppl dismissing this exploit. They did by far not fix this bug.
As I said, confirmed to work after the fix. Going to start doing this myself today.