Sun Feb 24, 2008 7:42 pm by brentbizzle
If it's a slim is DOES NOT involve downgrading. With 3.90 your only option is using pandora to reflash a different firmware. Look in our tutorials section. If you only have 1 psp at your disposal I have a guide I wrote up on how to use pandora with only 1 psp.
Founding father of the Wiibrew Packgen.
About 2 noob posts away from going ape sh*t