411 REFERENCE · Wikibooks
PSP/Install 6.20 OFW
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Download OFW 6.20 (use this version for PSP Go), and extract the file.
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 6.20.