Psp 352 M33 Upgrade To 660 Portable

How I Upgraded a PSP 352 M33 to a 6.60 PRO or Rebirth-Style Portable: A Step‑by‑Step Guide and Notes

If you own a PSP 1000/2000/3000 with a custom firmware (CFW) like the M33 series and want a modern, portable-feeling experience by moving up to a 6.60-based release (6.60 PRO/PRO-C or similar), this post walks through the motivation, what to expect, and a practical, low-risk path. This is written for hobbyists who want a cleaner, more compatible firmware experience while keeping their PSP fully functional for games, homebrew, and media.

You cannot jump directly from 3.52 M33 to 6.60 because the internal updater lacks the necessary keys to recognize newer firmware. You must first ensure you are on 3.52 M33-4. Check your "System Settings" -> "System Information." If it says "3.52 M33," you must install the M33-4 update. Place the update files in PSP/GAME/UPDATE. Run the update from the XMB (Cross Media Bar). 🔄 Phase 2: Installing Official Firmware 6.60 psp 352 m33 upgrade to 660 portable

• A PSP with a battery charged to at least 75% (100% recommended).
• A Memory Stick (Pro Duo or adapter) with at least 500MB free.
• The 6.60 Official Firmware (OFW) EBOOT (file name usually 660.PBP).
• The 6.60 PRO-C2 or 6.60 ME Custom Firmware files.
• (Optional but recommended) Hellcat’s Recovery Flasher 1.65 (specifically designed to jump firmware versions).

Prerequisites

Before starting, ensure you have the following: How I Upgraded a PSP 352 M33 to a 6