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For PSP 1000 and early 2000 models, you can make the custom firmware permanent (so it stays after a full shutdown). Run the from your Game menu. Press X to flash.

If you have a PSP 1000 or early 2000 (non-TA88v3), you can make the CFW permanent so it does not disappear when you turn the console off. Open the PROUPDATE folder again. Run the (included in the PRO-C2 download). Press X to flash the patch.

Modern PSP installers cannot read the original 3.52 M33 file structure. You must first update to the final revision of this firmware, which is .

You still cannot jump straight to 6.60. The system needs to be on at least a 5.xx generation firmware so the official Sony 6.60 installer can recognize the system configuration. We will bridge this gap using .