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Before installing new custom firmware, you need the official base version. Download OFW 6.60 : Locate the official Sony 6.60 update file (usually named ) from a reliable source like ConsoleMods Prepare the Memory Stick Connect your PSP to your PC via USB Mode. Navigate to the folder, then the Create a new folder named (all caps). Place the downloaded MS0:/PSP/GAME/UPDATE/ Run the Update Disconnect from the PC. On your PSP, go to Memory Stick and launch the "PSP Update ver 6.60".

If you have a or an early PSP-2000 (non-v3) , you can make the firmware permanent later.

For most games, leave it at “Default.” For demanding games (like God of War ), set “GAME CPU CLOCK” to 333/166.

You will need the Official Firmware (OFW) 3.52 M33-3 or M33-4 update, OFW 5.00, and finally OFW 6.60. Phase 2: The "Stepping Stone" (Upgrading to 5.00 M33)

Reboot your PSP fully (hold power switch up for 10 seconds, then turn on).