Psp 352 M33 Upgrade To 660 Portable

From 3.52 M33 to 6.60 PRO-C: The Ultimate PSP Upgrade Guide

If you’ve dusted off your old PlayStation Portable and seen the familiar "3.52 M33" splash screen on boot, you are holding a piece of history. The M33 series (created by the legendary team M33) was the gold standard of PSP custom firmware back in the late 2000s.

But let’s be honest: 3.52 M33 is ancient. It lacks support for newer games, PSN features, and modern homebrew.

Today, we’re going to take your vintage CFW and launch it into the modern era with 6.60 PRO-C, one of the most stable, feature-rich, and compatible custom firmwares available.

Warning: This process involves writing to the PSP’s flash memory. While safe if followed correctly, always ensure your battery is 100% charged and your AC adapter is plugged in.

Why Upgrade from 3.52 M33?

If you are happy playing old ISOs from 2007, you don't need to upgrade. But here is what you are missing: psp 352 m33 upgrade to 660 portable

• Game Compatibility: Titles released after 2009 (like Kingdom Hearts: Birth by Sleep) require 6.xx firmware.
• PS1 Classics: Official PSX emulation is much better on 6.60.
• No more "Trophies?": Modern plugins and recovery menus are cleaner.
• Wi-Fi: Modern WPA2 support (sort of) and Ad-hoc party compatibility.

Step 2: Installing 6.60 OFW (Official Firmware)

To get to the latest version, you must first install the official Sony firmware.

1. Download the official 6.60 Firmware (EBOOT.PBP).
   • Ensure you download the correct version for your PSP model (1000/2000/3000 or "Go").
2. Connect the PSP to your PC.
3. Create a folder named UPDATE inside ms0:/PSP/GAME/.
4. Place the 6.60 EBOOT.PBP file inside that folder.
   • Path: ms0:/PSP/GAME/UPDATE/EBOOT.PBP.
5. Navigate to Game > Memory Stick on your PSP and run the 6.60 Update.
6. Follow the on-screen prompts. The PSP will reboot.
7. Verify in System Settings that you are now on Version 6.60.

Part 3: Installing 5.00 M33-6 (Optional but Recommended)

If you want to keep custom features during the final jump, install 5.00 M33-6 first. However, you can also jump straight to 6.60 PRO.

To go straight to 6.60 PRO: Skip to Part 4.

To install 5.00 M33-6:

1. Download the 5.00 M33-6 updater.
2. Place it in PSP/GAME/UPDATE.
3. Run it. This will restore custom firmware ability.
4. Once on 5.00 M33-6, you can safely run the official 6.60 updater without the "9.90" error.

Part 5: Post-Upgrade Checklist – What to Do Next

You are now on the most compatible custom firmware ever made for PSP. Here’s how to optimize it:

1. Enable ISO/CSO Support: Press Select in the XMB. Under “UMD ISO MODE,” change from “Normal” to M33 driver or Sony NP9660. M33 driver offers the best compatibility.

2. Set CPU Speed: For most games, leave it at “Default.” For demanding games (like God of War), set “GAME CPU CLOCK” to 333/166.

3. Install Essential Homebrew:

   • CWCheat – For cheats and screenshots.
   • Game Categories Lite – Organize your ISOs into folders.
   • PSP Filer – A robust file manager.

4. Play Your Backups: Place any ISO or CSO file into the /ISO/ folder on the root of your Memory Stick (create it if it doesn’t exist). For PS1 eboots, place them in /PSP/GAME/.

What You Will Need

• A fully charged PSP battery (at least 75%).
• The official PSP power cord (do not rely solely on battery).
• A USB cable or a Memory Stick Duo card reader.
• File 1: Official Sony 3.71 Update (371.PBP)
• File 2: Official Sony 5.00 Update (500.PBP)
• File 3: Official Sony 6.60 Update (660.PBP)
• File 4: Hellcats Recovery Flasher v1.65 (to safely bypass the 3.52 M33 limitations)
• File 5: 6.60 PRO-C2 or 6.60 LME Installer

(Note: While we cannot host these files here, searching for "PSP 3.71 OFW" and "PSP 660 PRO-C2 download" on reputable homebrew sites will yield results).

Step 3: Installing 6.60 PRO-C (The Magic)

Now we turn that official firmware into a permanent custom firmware.

1. Download the PRO-C Update (look for PRO-C_660 release). Extract the zip.
2. Inside, find the /PSP/ folder. Copy the PROUPDATE and CIPL_Flasher folders into PSP/GAME/ on your memory stick.
3. Disconnect USB. Go to Game -> Memory Stick.
4. Run "PRO-C Updater" .
5. Press X to install CFW. Wait 5 seconds. Press X to exit.
   • Status: You now have temporary CFW. If you hard reboot, you go back to OFW.
6. To make it permanent: Run the "CIPL Flasher" application from the Game menu.
   • Note: CIPL only works on PSP 1000 and non-v3 2000 models. If you have a 3000 or v3 2000, you will need to use "Permanent Patch" instead, but CIPL is superior for your vintage hardware.