Things You'll Need
Instructions
Download any PSP PTF theme from the many different PSP themes websites found on the Internet.
Insert the PSP memory card into your computer's memory card adapter, or insert the PSP's USB cable into your computer's USB port.
Double-click the "PSP" drive found in the "Computer" menu after clicking the "Start" button. Open the "PSP" folder. There is a "Theme" folder found inside.
Right-click the PTF theme file and click "Copy" from the context menu that comes up. Right-click the "Theme" folder on the PSP memory card and click "Paste" to install the PTF theme.
Continue to install more themes in the same way, or pull the memory card or USB cable out of the computer. Insert the memory card into the PSP card reader.
Select the "Theme" option inside the "Settings" of the PSP menu. Select the theme you installed from the "Installed Themes" list.
Select the "Apply" option from the window that comes up to apply the new theme to your PSP. The theme is now being used on your PSP running 5.50 firmware.