Psp 352 M33 Upgrade To — 660

Technical Paper: Legacy to Modern – Upgrading PSP Custom Firmware from 5.50 M33 to 6.60 PRO/ME

Document ID: PSP-CFE-2025-01
Version: 1.0
Target Audience: PSP enthusiasts, retro console modders, firmware analysts

On PSP (now OFW 6.60), go to Game → Memory Stick™ → PRO-C2 Fast Recovery (run once to install CFW temporarily).

You’ll see “Press X to launch” – press X. PSP restarts into 6.60 PRO-C2 CFW.

Connect PSP to PC.
Navigate to PSP -> GAME folder on your Memory Stick.
Create a folder named UPDATE (all caps).
Place the downloaded EBOOT.PBP (6.60 firmware) inside the UPDATE folder.
Path structure: X:/PSP/GAME/UPDATE/EBOOT.PBP

Upgrading a PSP from the legendary 3.52 M33 firmware to 6.60 is like waking a time traveler. In the late 2000s, 3.52 M33 (created by the famous developer Dark_AleX) was the gold standard for homebrew. Today, 6.60 is the preferred destination because it offers the best balance of modern game compatibility and plugin support. Why Make the Jump? psp 352 m33 upgrade to 660

standard, you generally need to transition through the Official Firmware (OFW) first. This provides a stable base for installing newer custom firmware (CFW) like 6.60 PRO-C Phase 1: Update to Official Firmware 6.60 Technical Paper: Legacy to Modern – Upgrading PSP

This guide will walk you safely, step-by-step, from the vintage 3.52 M33 to the modern standard: 6.60 PRO-C2 (or 6.60 LME). We’ll cover everything from backing up your data to troubleshooting common errors. On PSP (now OFW 6

Connect Your PSP to Your Computer: Use a USB cable to connect your PSP to your computer.

Run the Installer: On the PSP, go to Game > Memory Stick and launch PRO Update.

Phase 4: Install 6.60 ME-2.3 (optional alternative)

ME offers better memory management (up to 64 MB user RAM on PSP-1000).
Install via ME Installer for 6.60 → LCFW mode.