1. Remove the UMD, Battery, Memory Stick, and Power Cable from the PSP.
2. Insert the Memory Stick ("Magic Memory Stick") you prepared beforehand into the bricked PSP.
3. Insert the battery ("Pandora Battery") you prepared beforehand into the PSP.
4. Boot the PSP. A menu will appear. Follow the onscreen instructions to reflash your PSP.
5. When the flashing process is complete, restart your PSP.
6. If all goes well, a blue screen will appear, telling you that your settings are corrupt, and to press circle to repair them. Do so now, rebooting your PSP if necessary.