: Confirm your current version in Settings > System Settings > System Information . 2. Resolving the "Version 9.90" Error
For many PSP enthusiasts, custom firmware 3.52 M33 (released by the legendary Team M33 back in 2007) represents the golden age of PSP hacking. It was stable, efficient, and opened the doors to homebrew, ISO loading, and plugins. However, time marches on. The PSP’s official firmware evolved significantly from 3.52 to 6.60, adding features like PlayStation Network integration, improved video playback, better security patches, and—most importantly—compatibility with modern homebrew and plugins. psp 352 m33 upgrade to 660
If you try to run the official 6.60 installer directly from 3.52 M33, your PSP will flash an error code (such as FFFFFFFF ) or refuse to launch the update. : Confirm your current version in Settings >
Sony changed the firmware key structures and update verification protocols in later firmware generations. To reach 6.60 safely, you must utilize a . You must first update your console from 3.52 M33 to 5.00 M33 (or 5.50 GEN-D3) , which updates the internal flash keys, allowing the official 6.60 installer to execute without errors. Step-by-Step Upgrade Guide It was stable, efficient, and opened the doors
Disconnect the USB, go to the menu on your PSP, and run the 3.52 M33-4 update.
Here is a comprehensive guide to upgrading your PSP from 3.52 M33 to 6.60. Why Upgrade from 3.52 M33?