3060000000059136CK sample of PSP Hack the book fame has a great how-to on using the eLoader to run homebrew on the PSP – “The solution isn’t in the form of a downgrader, but rather in the form of an eLoader (EBOOT loader) that lets you use Grand Theft Auto: Liberty City Stories to run homebrew on a PSP with version 2.0, 2.01, 2.5, and 2.6 of the firmware. Not all homebrew will run via this method, but there is a rather easy to read compatibility chart and I’m sure more things will begin working in future releases of the eLoader.” Link.