Your PSP must be charged to at least 78% . Connecting to a power source during the update is highly recommended to prevent a "power-off brick".
Use a reliable, formatted Pro Duo stick or a high-quality microSD adapter . psp 352 m33 upgrade to 660
Enter the Recovery Menu (hold the Right Trigger while booting) and disable all active plugins to prevent interference with the update process. Phase 2: Updating to 6.60 Official Firmware (OFW) Your PSP must be charged to at least 78%
This guide outlines the safest path to bridge the multi-year gap between these firmware generations. psp 352 m33 upgrade to 660
