Things You'll Need
Instructions
Connect your PSP to an electrical outlet using the included AC adapter. Insert a MemoryStick into the device; you will need at least 28 free megabytes. Power the device on.
Select "Settings" and "System Update" from the main menu.
Select "Update via Internet." Select your home wireless network. The PSP will connect to the network and check for available updates. Select an update to begin downloading it.
Select the update once it downloads to begin installing it. After the installation completes, you have successfully changed and upgraded your PSP's firmware.