Hey guys, haven't really contributed anything for this forum yet, and just remembered I haven't shared my tutorial yet. This is a quick tutorial I made for installing HEN on PSP 6.35 and below. I'm guessing it's more popular with people running 6.20 and 6.35 because 5.xx has CFW.

Very easy install and includes Promotheus ISO Loader to play your OWN games.

Cheers!

YouTube - PSP 6.35 HEN EASY Installation and ISO/CSO Loader!! ANY PSP FIRMWARE!