Place theme.p3t file in X:/PSP/THEME/ folder and select theme from XMB->Settings->Themes
X is your psp USB or PSP media card
Or Download Only theme file directly from your PSP internet browser.
Description:
Here's the Solar System Theme for the Fat PSPs. The planets are: Mercury, Venus, Earth, Mars, Jupiter, and Saturn.
You'll also notice the Wallpaper is no longer misspelled. The reason the previous theme was misspelled is because the author is Japanese...