You can now safely delete the update folders inside PSP/GAME/ to recover space. Your upgraded handheld is now fully compatible with modern homebrew applications, complex plugins, custom themes, and large capacity microSD adapters.
With your PSP resting cleanly on official version 6.60, you can choose your preferred modern custom firmware environment. The two standard options are or 6.60 ME-2.3 . For legacy PSP 1000 and 2000 models, 6.60 ME offers an excellent permanent installation. Download the 6.60 ME-2.3 (Permanent Installer) archive. Extract the files and look for the me_installer folder. Copy me_installer into your PSP/GAME/ directory. Launch the 6.60ME Installer from your XMB interface.
Updating a PlayStation Portable (PSP) from the aging custom firmware (CFW) to the modern 6.60 standard is a multi-step process that bridges years of software development. This upgrade allows your console to run the latest homebrew, emulators, and games while maintaining the benefits of a modified system. The Upgrade Path: From M33 to 6.60
Yes, but downgrading is risky and may cause issues. Pandora Battery methods are the safest way to downgrade.
Create a folder on your PC called PSP_660_Upgrade and place all these files inside. psp 352 m33 upgrade to 660
The installer will flash the custom elements directly to your PSP's internal memory chips.
You cannot jump directly from 3.52 M33 to 6.60 PRO-C2. You must first move to the official firmware base. Download the Official Sony 6.60 Firmware (EBOOT.PBP). Connect your PSP to your PC via USB. Navigate to PSP/GAME/ on your memory stick. Create a folder named UPDATE . Place the EBOOT.PBP file inside the UPDATE folder.
Disable any plugins in the 3.52 M33 recovery menu to avoid conflicts. Step 1: Install Official Sony Firmware 6.60
PSP/GAME/UPDATE/
Modifying your PSP’s firmware carries inherent risk. This guide is for educational purposes. The author is not responsible for bricked devices. Always follow steps carefully and ensure you have a Pandora battery or Baryon Sweeper kit if you own a fully hackable PSP-1000.
This guide outlines the safest path to bridge the multi-year gap between these firmware generations.
: These models require the Infinity patch.
On your PSP, go to Game > Memory Stick and run the update. Restart: Your PSP will reboot, now running Official 6.60. You can now safely delete the update folders
If your PSP completely loses battery power, it may boot back into official firmware. Simply run the FastRecovery app from your game menu to restore your CFW instantly.
M33’s log closed with one final line before sleep: "Preserve what sings. Improve what breaks. Ship it light." The upgraded PSP, a copper-and-plastic heart with a software smile, held that sentence like a battery saving mode — small, persistent, and enough.
It wasn't all polish. M33 kept its foxholes: an experimental corner where the filesystem still hummed with oddities, where unsigned code could be coaxed to sing. 660 brought a discipline to those corners — a promise that chaos could be tamed without killing it. Developers found their tools less combative; players found odd games that had crashed before now finished their stories.