Thread about 6.00 Debug firmware for the PSP :)
Google Translate - There is a link and a discussion of the debug firmware here
To install, copy the EBOOT to the root of the memory stick and run XGEN V2 to install... XGEN V1 will not work.
Here is a quick demo of the what debug firmware does
Basically debug firmware is a special type of firmware that allows users to test games and change hidden options of the PSP. Note this is only the firmware, the actual Devkit PSP console is very expensive and needs a license. :)
But I've posted the leaked firmware here :)
Post any questions and talk here ;)