First let me say that 2 hours of searching and googling turned up either no answer, vague answers, or just more questions. From what i understand, the 6.20 perma-patch uses a kernel mode exploit in vsh to load into a HEN environment, and the 6.39 uses a custom IPL that will load unsigned code MUCH like the old 5.xx (m33 and gen) CFW's did. Is that correct? I have a 2001 model psp, 02g, fully hackable. Which is "better", the 6.20 exploit or the 6.39 cIPL hack? Is either better from a technical standpoit, is either one more eficient, brick-resistant, less-memory-card-reliant? Any further details on the differences would help a lot. Thanks for any expert answers. If you are in the same confused boat i am in, feel free to chime in with your additional want of answers, but please dont present OPINION as FACT. I'm not asking whether 6.20 or 6.39 firmwares are better, just their patching methods for permanency on older PSPs. thanks you!