Now that you’re on official 6.60, you’ll install the “660 portable” custom firmware.
For many PlayStation Portable enthusiasts, the "M33" custom firmware series by Dark_AleX represents the golden age of PSP homebrew. If you are still running 3.52 M33-4, you are using a firmware that is nearly two decades old. While it was legendary for its time, it is now severely outdated.
Modern custom firmware, specifically 6.60 PRO or 6.60 ME (Minimum Edition), offers superior game compatibility, better plugin support, and a built-in PS1 emulator that doesn't require complex popsloader setups. psp 352 m33 upgrade to 660 portable
Here is the guide to safely bridging the gap from the M33 era to the modern 6.60 standard.
Before starting, ensure you have the following: Now that you’re on official 6
Before jumping to 6.60, it is often safer to update your current M33 firmware to version 4 to patch the flash writing capabilities.
Once you have flashed the system to 6.60 (official or temporary custom firmware), you need to install the permanent custom firmware. Before starting, ensure you have the following:
For 6.60 PRO-C2:
For 6.60 ME (Minimum Edition):
PSP/GAME/UPDATE/ (create the UPDATE folder).