I don't know if this is allowed here since it's homebrew but the code is all legit,
http://www.noobz.eu/joomla/news/pandoras-battery.html/Quote:
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.
