It's probably best to update to a higher firmware, I'm not sure if 1.50 supports themes and plus there are a crap load of themes for higher firmwares. You either download the theme .PTF or .CTF file and stick it in the THEME folder under
/PSP/THEME
Then go to the theme settings in the xmb and select a theme.
You might have to download a certain theme enabler for different firmwares.
Last edited by AdventWolf on Tue Jan 20, 2009 8:26 pm, edited 1 time in total.
If you're not interested in updating (even though i would recommend updating) you can throw pictures that you have on your memory card as your wallpaper. Just view them on your psp then hit triangle i believe to bring up some icons and select set as wallpaper (or something along those lines)
Anyways, 4.01 m33 is a good firmware to update to
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