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PSP/Install OFW 6.60
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Method 1: Connect to Wi-Fi. From the XMB (main psp menu), run System -> Network Update to install OFW 6.60.
Method 2: Download OFW 6.60 from Sony's site, and extract the file. (There are two different versions for PSP and PSP Go!)
Copy EBOOT.PBP to PSP/GAME/UPDATE/
From the XMB (main psp menu) run the update from Game –> Memory Stick.
You have successfully installed OFW 6.60.