I am about to downgrade my PSP from Sonys official update 3.5 to "default" 1.5. I need to know (and all help is appreciated) how to run ISO/CSO's on my PSP. I know you need DEVhook or fastloader but there are so many versions I don't know which ones will work. And second if I use custom firmware like Dark Alex's firmware, how do I use ISO/CSO and which versions of Dark Alexs firmware is better for running ISO/CSO's. Again I will take any advice, or suggestions!