Brewology

just use the STX version changer from http://www.sonyxteam.com and it will work.

all you have to do to get emulators is go to our brewpack generator and download something. Then connect your usb cable and connect to your pc. Once you have that done, just drag the file/folder into your memory stick and there you go, you have homebrew on your psp now. And use that link above to change your firmware version so your umd game will work.