: You may need to update to an intermediate version like 3.52 M33-4 first, or use a tool like KeyCleaner if your system’s IDStorage keys are corrupted from old hacks. Phase 2: Updating to Official 6.60 How To Update Your PSP TO 6.61 Official Firmware
Press to install the firmware. The process takes less than five seconds. psp 352 m33 upgrade to 660 portable
Copy both folders into the PSP/GAME/ directory of your Memory Stick. : You may need to update to an intermediate version like 3
Download the from a reputable PSP homebrew archive. psp 352 m33 upgrade to 660 portable