How to Fix a Full Brick PSP

Put down a clean cloth. Place the PSP face up on the clean cloth. Open the battery compartment and remove the battery. Put the battery aside. Pick up a Memory Stick PRO that has the "Magic Memory Stick" software loaded. Open the memory slot cover and insert the Memory Stick PRO into the PSP's memory slot. Close the memory slot cover.

Pick up a Pandora battery and insert it into the PSP's battery slot. Put the battery compartment back in place over the battery and turn the PSP face up on the clean cloth.

Wait as the PSP turns itself on and presents a selection screen. Use the D-Pad to select the setting for the PSP to reboot itself with firmware 4.21. Press the "X" button to make the selection go into effect.

Wait as the firmware formats the PSP and installs itself into the PSP's operating system. Use the D-Pad to select the setting for the PSP to shut itself down. Press the "X" button to make the selection go into effect.

Wait as the PSP shuts itself down. Turn the PSP face down on the clean cloth. Remove the battery compartment and take out the Pandora battery and replace it with the original battery that came with the PSP. Replace the battery compartment. Remove the memory stick.

Turn the PSP face up on the clean cloth. Hold down the power button to reset the PSP and bring up the setting to reset the Flash memory of the PSP using the DPad and pressing the "X" button to make the setting go into effect.

Wait as the PSP reboots itself. Press the "X" button to indicate agreement with the PSP license. Wait as the PSP goes to the Home screen.