I've been out of the scene, but recently I started playing my PSP again, and I've wanted to play some games my friend bought from PSP, problem is I need to have version 6.20. I currently have 4.01 M33.

My question is, what is the most recent custom firmware I can get for my PSP-1000? I was looking at Liquidzigong's PSP CFW 6.35 PRO-A, but from what I can tell, it's more of a HEN, isn't it?