Downgrading psp?

i recently bought a psp slim it has 3.93 offical firmware anyway to downgrade?

u need a memory stick,battery, use pandora which will make battery useless buts it worth it.after downgrading to 1.5 go to dark alex site to update to 3.90m33 cfw but dont 1.5 kernel because its only for psp fat.then add the 3 patches ;D hope this helps.also make sure u hav 1.5 update,3.90 update for cfw

were are you surpose to get these

try www.psp-hacks.com/