From http://www.noobz.eu/
So basically this thing can downgrade or unbrick ANY PSP. Now I wonder if price of bricked PSP will go up.
Sounds like good news for the PSP owners! Hopefully this will work on the Slim.
QUOTE said: 1. You run a program on a homebrew-enabled PSP that will convert a standard PSP battery into a jigkick battery. Note that you can't then use that battery normally - so you should use a spare one.
 2. You run a program to generate the unbricker memory stick image, built from the v1.5 update EBOOT (note that this, and the custom IPL, means the release is completely free of Sony copyright materials).
 3. You run some programs on a PC to install the image to your memory stick.
Now, you have a battery/memory stick pair that works just like the famous jigkick combination (but better) - just insert them into any PSP (even a brick) and the PSP will be reinstalled with the v1.5 firmware. As far as we know, this will continue to work for all future firmwares.
So basically this thing can downgrade or unbrick ANY PSP. Now I wonder if price of bricked PSP will go up.
Sounds like good news for the PSP owners! Hopefully this will work on the Slim.