Originally Posted by
MGFox
HumanIce: I'd be very cautious with this information if you're not sure what you're doing (i.e. back stuff up!), but don't be afraid to have a peek ...
On Dark-Alex firmwares hold 'R' as you coldboot your PSP and you'll enter "Recovery Mode" in all it's glorious blue-ness. From there (under 'Advanced') you can access the flash memory of your PSP directly via USB, as if it was any old regular USB drive. Then follow IceMan's guide.
Be careful though, you can easily make your PSP fubar! (aka. a Brick)
EDIT: Almost forgot ... Awesome waves, thanks for sharing :D
Cheers,
Fox