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How to Install CSO

CSO is a file format used to store compressed PlayStation Portable (PSP) games. These files are converted from the original universal media discs (UMDs) the PSPs normally use to run games. While CSO files can help you preserve your original UMDs as well as the battery life of your PSP they can only run on custom firmware. The CSO files are then installed by placing them inside a specific folder on the memory stick for your PSP.

Instructions

- 1
  Connect your PSP to your PC with a mini-USB cable. Boot your PSP, then use the d-pad to scroll left on the menu bar until you reach the "Settings" option.
- 2
  Press "Up" on the d-pad until you reach the "USB Connection" setting. Press "Select" to bring up the custom firmware menu and check that "USB Device" is set to "Memory Stick." If it is not press the d-pad left or right to cycle through the options until it is set to "Memory Stick."
- 3
  Press "Select" to close the custom firmware menu again the press "X" to start the USB connection. Click "Open Folder to View Files" from the autorun menu that appears on your computer screen.
- 4
  Double-click the "ISO" folder in the root of the memory stick to open it. If the folder is not present, right-click, then select "New" and "Folder." Type "ISO" as the folder name and press "Enter."
- 5
  Copy the CSO file from the location where you have it saved to the ISO folder on the memory stick. Left-click and hold down the button over the CSO file then, while holding down the left mouse button, drag the file to the ISO folder on the memory stick. Release the left mouse button and the file will start copying.
- 6
  Close the window once the file copied over successfully. Press the "Circle" button on your PSP to close the USB connection. Unplug the USB cable, then use the d-pad to scroll right on the PSP menu until you reach the "Game" option.
- 7
  Press "X" and a list of all the CSO games installed on the memory stick will be shown. Scroll up and down through the list with the d-pad and press "X" to launch the game.

Sony PSP