Things You'll Need
Instructions
Insert the UMD game you want to transfer into a PSP with custom firmware version 3.52 M33 or higher.
Start your PSP. Go to "Home" (it should be the "M33 VSH" menu) screen.
Connect your proprietary USB cable from your PSP to your PC.
Change "USB Device" to "UMD Game" on the Home screen. Press the "Select" button to exit.
Scroll to the bottom of the main menu and change the device to "USB Mode." Your PC should detect the PSP shortly. Wait for a window to pop up. The file in the window should read something similar to "UMD9660 ISO Image file."
Copy that file. Paste it on your desktop. Be patient, as this can take a while. Once completed, rename the file to something easier for you to remember.