you need to update it like by putting new games that have higher update versions and your psp will be updated and you will get cool stuff like the tasty treat theme.
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YES. You can put the same themes on all models of psp
first open your psp folder then you should see a theme folder drag the theme in to there if not create a new folder in capitals called THEMES in the psp folder.
you can get themes from games and your computer/laptop. games=completing levels,missions,goals,set of levels. computer/laptop=get the picture on your computer/laptop then connect the PSP to the computer/laptop and put it in the PSPs memory.
the best place is to go to www.free psp wallpapers.com
no you cant because their to different systems designs so no you cant sorry.