If you lost or forgot your PSP password, here’s what u need to do:
You can restore the PSP to the default factory settings to reset the password to 0000. To restore the settings:
1. Highlight 
(System Settings) under 
(Settings) from the home menu, and press 
.
2. Select Restore Default Settings and follow the on-screen instructions.
Note: If you restore the settings to reset the password, on you’r psp other settings will also be lost. Once these settings are lost, they cannot be recovered and you will have to manually set them again.