ok now this is pretty simple just put that "boot" folder in x:/psp/game.

done?

now turn off you psp then hold the R button while turning on your psp click x on configuration. 

done?

now click x on "autorun program at /psp/game/boot/eboot.pbp (if enabled will show "currently: enabled").

done?

now exit you will see a picture that i premade for the program, after a bit it will goto the xmb now goto xmb mode.

done?

now open "psp" then "game" then "boot" then "applications" then "lowser" and replace "background.jpg" with any image you want.

now your done :P 