So as you can see in the title I have a PSP 3000 with 6.20 OFW... I have read the forums and it says psp-300X= all are semi-hackable if ur firmware is 6.20 or lower.. I downloaded and installed 6.20 TN-E. Thats all ive got. My question is everyone is saying 6.20 PRO-B8 is much better. Therefore I want to change my firmware back to OFW 6.20 and then download 6.20 PRO-B8, How do I do that? and after I download 6.20 PRO-B8 what do I do to play isos and csos? Thanks alot for your help guys :)

-Gangstuh