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.
