For years, the 3.52 M33 custom firmware (CFW) was the gold standard for PlayStation Portable hacking. Created by the legendary developer Dark_Alex, it unlocked the true potential of the PSP. However, modern homebrew, plugin compatibility, and newer ISO releases require a modern firmware base. Upgrading from 3.52 M33 directly to 6.60 or 6.61 Custom Firmware ensures maximum compatibility while retaining your ability to run portable homebrew, emulators, and backups.
This guide primarily uses the CFW, but alternatives like 6.60 ME 1.8 offer similar or better performance depending on your needs. For most users, PRO-C is an excellent choice for its wide plugin and game support.
Keep the PSP plugged into a wall outlet throughout the process.
Once you are on 5.00 M33-6, your PSP’s internal "keys" are updated, making it safe to move to 6.xx. Phase 3: Moving to Official 6.60 psp 352 m33 upgrade to 660 portable
Before you begin, it's crucial to prepare your PSP and your files. A solid foundation will prevent issues later on and safeguard your data.
Because the PSP 1000 and early PSP 2000 models feature a fully hackable custom IPL (Initial Program Loader), you do not need to use "Fast Recovery" every time your system restarts. You can make the 6.60 CFW permanent.
: The 6.60 kernel includes official Sony system fixes that are not present in the 3.xx branch. Upgrade Path and Troubleshooting For years, the 3
Head over to the official website of the 6.60 Portable CFW and download the latest version. You can find the download link on various PSP forums and websites. Once you've downloaded the CFW, extract the files to a folder on your computer.
Now that you are on official firmware 6.60, you are no longer "hacked." You must install a modern Custom Firmware. is the standard choice for most users.
Some modern PRO updaters can flash directly from older M33, but it is risky on 3.52 due to kernel differences. If you attempt this: Upgrading from 3
Before installing new custom firmware, you need the official base version. Download OFW 6.60 : Locate the official Sony 6.60 update file (usually named ) from a reliable source like ConsoleMods Prepare the Memory Stick Connect your PSP to your PC via USB Mode. Navigate to the folder, then the Create a new folder named (all caps). Place the downloaded MS0:/PSP/GAME/UPDATE/ Run the Update Disconnect from the PC. On your PSP, go to Memory Stick and launch the "PSP Update ver 6.60".
models, you can make the CFW permanent. For other PSP-2000 (TA-088 v3), PSP-3000, PSP Go, and PSP Street (E1000) models, a permanent patch is not possible due to motherboard restrictions. In that case, you must run "Fast Recovery" after each cold boot.
Upgrading a running the legendary 3.52 M33 firmware to a modern 6.60 or 6.61 environment is like bringing a classic car into the modern era. While 3.52 M33 was a milestone in the "Dark Alex" era of homebrew, it lacks compatibility with later games and modern plugins. Phase 1: The Prerequisites