Instructions
Turn your PSP off if it isn't already by sliding the "Power" button up until the screen goes black. Unplug your A/C adapter so the PSP doesn't charge when entering the "Recovery" menu. Locate the right trigger on your PSP and hold it down.
Slide the "Power" button up while still holding the right trigger on your PSP. Hold the "Power" button up until the PSP turns on. You'll be greeted by the "Recovery" menu of the PSP̵2;the menu will either be in red or green text.
Push the digital game pads up and down to navigate through the PSP "Recovery" menu. Select an item to be given further options that will help you fix your PSP and make it operable once again. When you're finished, press "Exit" on the main "Recovery" menu.