Things You'll Need
Instructions
Hold the PSP power button to turn off the PSP. Hold the "Right" trigger button on the PSP and turn it back on to enable recovery mode.
Select the "Configurations" option in the PSP recovery menu. Select the "Game folder homebrew" option until "currently: 5.xx Kernel" comes up.
Select "UMD Mode" until "Currently: M33 driver -NO UMD-" comes up. Select "Back" to return to the main recovery menu.
Select "Exit" to turn the PSP off. Turn the PSP back on and connect it to your computer with a mini-USB cable.
Right-click the "Motorstorm" ISO file and click the "Copy" option from the context menu. View the folders on the PSP memory card and right-click the "ISO" folder.
Click "Paste" and pull the mini-USB cable out of the computer when the copying finishes. A "Motorstorm" icon is created on the PSP menu. Select the icon to play it on the PSP.