Instructions
Select "Settings" from the main menu bar by navigating to the option with the directional buttons.
Push the down button to find the "System Settings" option and press the "X" button.
Scroll down the menu options to "Restore System Settings." Press the "X" button. A list of settings that will be restored is displayed. Press the "X" button to start. When the reset is complete, press the "X" button to restart the PSP.