I'm downgrading for a friend. I have pandoras battery to do this procedure. He has a Phat PSP Official FW 3.60 and i would like to downgrade and put CFW 3.90m33 on there. IS this possible? And if it is could i have some links for some easy step guide. Thanks.
ya here use this http://forums.afterdawn.com/thread_view.cfm/610313 or http://forums.afterdawn.com/thread_view.cfm/610312 you need a psp already running custom firmware to do this