Connect your PSP to the PC. Extract the archive and copy the PROUPDATE and FastRecovery folders into your PSP/GAME/ directory.
: Obtain the official EBOOT.PBP for the 6.60 update.
Because 3.52 M33 is a legacy firmware from 2007, you cannot simply "hop" directly to a modern CFW without first returning to a stable official baseline. How to update from custom firmware 3.52 M33 to 3.52 M33-4 psp 352 m33 upgrade to 660
Upgrading your legacy PSP unlocks maximum game compatibility, modern homebrew applications, and highly stable permanent custom firmware (CFW) options like or 6.60 ME-2.3 . This comprehensive guide provides the exact steps, prerequisites, and troubleshooting techniques required to safely modernize your classic handheld. Why Upgrade from 3.52 M33 to 6.60?
Copy the 5.00 M33 installer files into this new UPDATE folder. Connect your PSP to the PC
Legacy M33 firmware frequently alters system keys to prevent users from accidentally flashing official software over their custom configurations.
Safely disconnect the USB, navigate to , and boot the 5.00 M33 installer. Because 3
Ensure your PSP has at least 75% battery or is connected to the charger. Backup Data: Copy your memory stick data to your PC.
from the venerable custom firmware (CFW) to the modern 6.60 ecosystem is a vital step for ensuring compatibility with newer games, homebrew, and stable plugins. While 3.52 M33 was a landmark in PSP modding, the 6.60 firmware remains the gold standard for versatility and reliability across all PSP models.
Upgrading from to 6.60 PRO-C2 or 6.60 ME-2.3 is highly recommended for any PSP user seeking modern game compatibility, improved plugin support, and performance enhancements. The process is low-risk if official NAND backups are made and power stability is ensured. Users with PSP-3000 or later should avoid permanent patches and rely on FastRecovery. The 6.60 CFW ecosystem represents the most stable and feature-complete endpoint for PSP homebrew, superseding the M33 lineage entirely.