411 REFERENCE · Wikibooks
PSP/Install ME CFW
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Download ME 1.8, and extract it.
Copy the entire contents of the extracted folder to the root of the memory stick.
Go to Game -> Memory Stick and run the ME Installer for 660.
Press X to install. Your PSP will then restart.
6.60 ME is now installed on your PSP.
To uninstall ME CFW, run the ME Installer for 660 and press Square.