Things You'll Need
Instructions
Save your CSO game file to the desktop of your computer.
Connect the small end of your USB cable to the PSP and the large end to your computer. Select "Settings" and then "USB mode" from your PSP controller.
Download custom PSP firmware such as DevHook v0.45, (see Resources.)
Right-click on the firmware icon that has appeared on your desktop and click "Extract." Select the external PSP folder and click "Extract." The firmware will be installed on your PSP.
Go to "Start" and "My computer" from your Windows desktop view. Double-click on the external PSP drive.
Click on the "New Folder" icon in at the top of the window. Click on the words "New folder" and type "ISO."
Click on the CSO game file on your desktop and drag it to the ISO folder you just created and drop it inside.
Disconnect the PSP from your computer.
Toggle to "Games" on your PSP and click "X" on the name of the CSO game to play it.