Hey I have a PSP 3000 and I downloaded and installed (have) 6.20 PRO-B8. Is this Custom Firmware? and I know it can play isos and I have 2 game isos on my psp :D but what else can I do? The thing is I only have barely have any mbs on my psp after I downloaded the 2 isos. :(. So again the question is what are the benefits of having 6.20 PRO B-8 and is this a Custom Firmware?