To perform a hard reset on the PSP, go to System Settings, and select Restore Default Settings. Restart the console, and input "0000" when prompted with a password request to access the system.Continue Reading
To prevent data loss, backup all saved game files, music, images and themes you have saved on the PSP by inserting the console's SD memory card in a media card slot on a desktop computer or laptop. Locate the removable disk from within the computer's file system, and open it. Copy the files from the SD memory card, and paste them in your desired location within your computer's file system. Insert the memory card back in the PSP.
From the home screen, navigate to Settings, and open it. Open System Settings from within Settings, and select Restore Default Settings. Choose Yes when the "Are you sure?" prompts pop up, and wait for the system to perform an active restore.
Restart the system. If you come across a password prompt, enter "0000." Reconfigure your desired system settings. Insert the console's SD memory card in your desktop computer or laptop again. Transfer the copied files back to the memory card, then insert the memory card back in the console.