Do you have a hacking program on your computer? if you dont, I recommend NightPR.
Download: NightPR
1. Copy nitePR.prx to ms0:seplugins
2. Copy UCUS-98645.txt to ms0:sepluginsnitePR
3. If ms0:sepluginsgame.txt doesn't exist, create it
4. In ms0:sepluginsgame.txt add this line: ms0:/seplugins/nitePR.prx
5. Save ms0:sepluginsgame.txt
6. Turn off the PSP and then turn it on again while holding R-TRIGGER
7. In OE's BIOS, go under plugins and when you see nitePR, enable it
Then, go to your UCUS-98645 folder and type in your code. Save it, and go to your game.
When your game is running, press the vol. - and + and the same time to go to your cheat menu. go down and press X or [], if its blue, it means its on all the time, if its white, it means you have to activate it. To activate codes, press the note button. (music button)