1. Make sure 'theme' folder under '/PSP/' path from your psp. If not exist there that just make 'theme' folder.
2. Downloads current psp go themes.
3. Unzip your downloaded file and findout the 'ptf' file. Copy the 'ptf' file into psp 'theme' folder.
4. Goto your psp theme setting function and set downloaded theme as defualt.
5. That's it.