Are you talking about the stuff I sent you my friend?
Hmm... what's your firmware?
If you are really really into PSP customisation, the ideal firmware for you is 3.03 OE - C if you REALLy want to go to town as it has the most flash0 space or 3.52 M33 - 4 if you wish to stay up to date. Don't worry about games, even 3.03 OE - C can still play the latest games! I tried it!

It may be a security thing from Sony. Did you try all the sounds?