This guys made a great video of downgrading your psp. Make sure to back up your files before trying.
{August 28, 2008}
Downgrade PSP ! All Versions
{August 28, 2008}
Just got a new slim psp
3 days back i got my new psp slim version from my brother…trying to crack it with pandora battery, will do it soon. Right now playing the demo games and listening the mp3s.
Haranded's Weblog 