Things You'll Need
Instructions
Turn off your PSP and remove all peripherals, including the memory stick, battery and any UMD game in the UMD drive. Also, make sure the charger is not inserted into the PSP.
Insert your magic memory stick into the PSP card reader. Now, insert your Datel service battery into the PSP. Your PSP will turn on automatically and you will be presented with a black screen with a list of options that your Datel battery can perform.
Press the "X" button on the PSP gamepad to install the custom firmware. You will be asked to confirm this decision by pressing "X" again. Press it. Wait as your PSP is upgraded to custom firmware.
Press "X" again to restart your PSP after the Datel service battery tells you to. Your PSP will recycle its power and restart, bringing you to your PSP home menu. Remove the Datel service battery and the magic memory stick, and replace them with your regular peripherals.