Sry, i do not know how to do it. can some1 teach me step by step? ty

1. turn on your psp, connect your psp to your pc using a usb cable, then go to settings, scroll down to usb connection and press o button

2. go to my computer(in your computer of course) open the new removable disk that has appeared, look for a folder named PSP (if you dont have one, create a folder named PSP) inside that folder make a new folder named PHOTO(if you have one dont create it)

3. now, take your wallpaper and transfer into the PHOTO folder (copy and paste, baby!!) if you finish transfer, push x button on your psp, that should disconnect your psp from your pc

4. setting your wallpaper on your psp, in your psp main menu go to PHOTO, there are camera and memory stick, click on the memory stick, now you will see your wallpaper, select and open it push o button, and then push triangle button, and choose "set as wallpaper" push o button, it will ask you "do you want to overwrite the wallpaper...blablabla" just click "yes" now go back to your psp main menu push x button, and viola!! you should have the new custom psp wallpaper for your background

ps: when your psp is connecting to your pc, for your own psp safety, please DO NOT!! remove psp battery or memorycard or usb cable, turn off your psp or your computer, if you want to disconnect your psp from your pc just push the x button, if you still want to do that, well....(only Jesus knows)....your psp will be broken 4ever, and you will lived happily ever after...good luck