| Item | Specification | |------|----------------| | PSP Model | 1000, 2000 (non-TA-088v3), 3000, Go, E1000 (Street) | | Battery | ≥75% charge | | Memory Stick | ≥256 MB (512 MB+ recommended) | | USB Cable | Mini-USB (for PC transfer) |
| Feature | 5.50 PROM-4 | 6.60 PRO-C2 | |---------|--------------|--------------| | Kernel version | 5.50 | 6.60 | | NAND driver | Old page size (512+16 bytes) | New page size (4096 bytes for PSP-Go) | | ISO driver | M33 driver (limited) | Inferno driver (faster + better compatibility) | | PS1 emulation | POPS 5.50 | POPS 6.60 (better audio sync) | | Plugin memory | 24 MB reserved | 32 MB reserved | | CIPL support | Yes (full permanent) | Yes (with CIPL flasher) |
Depending on your motherboard:
Tested on PSP-2000 (Slim), Memory Stick Pro Duo 8GB (Sony).
| Operation | 5.50 PROM-4 | 6.60 PRO-C2 | |-----------|-------------|-------------| | XMB boot time (cold) | 8.2 sec | 7.5 sec | | ISO load (GTA: VCS) | 14 sec | 11 sec | | PS1 emu (FFVII) | 60 FPS (drops) | 60 FPS (stable) | | Homebrew mem alloc | 24 MB max | 32 MB max (ME) |
On the PSP 1000 and most PSP 2000 models, you can make the custom firmware permanent so it stays even after you shut down the console.
For PSP 3000 / Go / Late 2000 models: You
Upgrading a to the final 6.60 firmware is a multi-step process because older Custom Firmware (CFW) versions like 3.52 M33 often block official Sony updates to prevent accidental loss of homebrew capabilities. 1. Preparation and Safety Charge your battery
: Ensure your PSP is charged to at least 78% (preferably 100%) and kept plugged into a power source during the entire process. Check for obstructions
: Some older M33 firmwares use a "version.txt" file to trick the system into thinking it is on a higher version (like 9.90) to block updates. If your PSP says it doesn't need an update despite being on 3.52, you may need to disable this in the Recovery Menu or via the VSH Menu. 2. The Upgrade Path
Because 3.52 M33 is extremely old, you typically cannot jump directly to a modern 6.60 CFW without first returning to Official Firmware (OFW) or passing through an intermediate version. Step A: Upgrade to Official Firmware 6.60 Download OFW 6.60 : Obtain the official Sony for firmware 6.60. File Placement : On your Memory Stick, create the folder path PSP/GAME/UPDATE/ and place the Run the Update : Navigate to Game > Memory Stick on your PSP XMB and launch the 6.60 Update. Troubleshooting
: If you receive a "DRNFFFFFFCD" or "dadada" error, you likely have corrupted "keys." Use a tool like Chilly Willy's Key Cleaner to fix your IDStorage before trying the update again. PSP: Updating from the 3.xx OE CFWs to the 6.60 ME CFW 5 Sept 2013 —
To upgrade a PlayStation Portable (PSP) from the ancient 3.52 M33 custom firmware to 6.60, you cannot jump directly through the standard update menu.
Older M33 firmwares include a built-in block created by the legendary developer Dark_Alex to prevent users from accidentally overwriting their custom firmware with official Sony software. To successfully transition your console, follow this step-by-step pathway. ⚠️ Prerequisite Checklist
Battery Charged: Ensure your battery is at least at 78% (the updater will hard-block you if it is low). psp 352 m33 upgrade to 660
Power Supply: Keep your PSP plugged into the wall charger during the entire process to prevent a brick.
Storage Check: Use a reliable Sony Memory Stick or a formatted MicroSD adapter with at least 64MB of free space. 🛠️ Step 1: Spoof the Version or Use Chronoswitch
Because 3.52 M33 tricks the system into thinking it cannot be updated, attempting a straight 6.60 installation will usually trigger an error like DADADADA. To bypass this, you need to use a downgrauber/restorer tool or clean the keys. Download the official Sony 6.60 OFW EBOOT.PBP.
Download a tool called Chronoswitch Downgrader (Version 7.0 or newer), which ignores the M33 software blocks. Connect your PSP to a computer via USB.
Put the official EBOOT.PBP file into the folder: ms0:/PSP/GAME/UPDATE/ (create the folders in all caps if they do not exist).
Put the Chronoswitch files into ms0:/PSP/GAME/CHRONOSWITCH/. 🔄 Step 2: Flash Back to Official Firmware (OFW) 6.60
We must return the console to a blank slate before installing modern custom firmware.
Upgrading a PlayStation Portable from the legacy 3.52 M33 custom firmware (CFW) to the modern 6.60 standard is a critical step for modern homebrew compatibility, better PS1 game emulation, and access to newer titles. Prerequisites & Preparation
Hardware: Ensure your PSP is at least 78% charged and plugged into a power source to prevent a "brick" (permanent software failure) during the flashing process.
Memory Stick: Use a reliable Memory Stick Pro Duo or a microSD adapter with at least 2GB of space. Required Files: Official Firmware (OFW) 6.60: The base system update.
Custom Firmware (CFW) 6.60 PRO-C2 or ME: Your choice of modern custom firmware.
Storage Path: Connect your PSP to a PC and place the EBOOT.PBP update file in the following directory: ms0:/PSP/GAME/UPDATE/. Phase 1: Upgrading to Official Firmware 6.60
Before installing modern CFW, you must move from your current legacy CFW back to the official 6.60 base.
To upgrade your PlayStation Portable (PSP) Go to product viewer dialog for this item. | Item | Specification | |------|----------------| | PSP
from the vintage 3.52 M33 custom firmware to the modern 6.60 standard, you need to follow a specific two-step path. Because 3.52 M33 is so old, modern 6.60 installers often cannot recognize it directly.
The safest method involves first updating to Official Firmware (OFW) 6.60 and then re-installing custom firmware (CFW) like 6.60 PRO-C or ME-2.3. Prerequisites
Battery Charge: Ensure your PSP is charged to at least 78%. If the power cuts during a firmware write, you may "brick" (permanently break) the console.
AC Adapter: Keep the PSP plugged into a power source throughout the process.
Memory Stick: A standard Memory Stick Pro Duo with at least 500MB of free space. Step 1: The "Bridge" Update (OFW 6.60)
Since 3.52 M33 is an early custom firmware, you must first return to a clean official state to ensure the filesystem is prepared for modern kernels.
Download 6.60 OFW: Obtain the official EBOOT.PBP for the 6.60 update.
Prepare the Stick: Connect your PSP to your PC. Navigate to /PSP/GAME/ and create a new folder named UPDATE.
Transfer: Move the EBOOT.PBP into the /PSP/GAME/UPDATE/ folder.
Run the Update: On your PSP, go to Game > Memory Stick and launch the 6.60 Update. Follow the on-screen prompts to install.
Note: Your PSP is now on official firmware and cannot run homebrew or ISOs yet. Step 2: Install 6.60 Custom Firmware (CFW)
Now that you are on official 6.60, you can install a modern, stable CFW. 6.60 PRO-C is the most widely recommended for its compatibility.
Download PRO-C: Download the 6.60 PRO-C2 (or PRO-C Fix3) files.
Transfer Folders: Copy the PROUPDATE and FastRecovery folders from the download into your PSP's /PSP/GAME/ directory. Tested on PSP-2000 (Slim), Memory Stick Pro Duo 8GB (Sony)
Run the Installer: On the PSP, go to Game > Memory Stick and launch PRO Update.
Install: Press X to start the installation. Once finished, press X again to launch the CFW. Step 3: Making it Permanent
Depending on your PSP model, the CFW might vanish if you fully power off the console.
PSP 1000 & 2000 (Non-v3): Use the CIPL Flasher (included in most PRO-C downloads) to make the CFW permanent. Run it from the Game menu and follow the prompts. Go to product viewer dialog for this item. Go to product viewer dialog for this item.
: These models cannot use the CIPL Flasher. Instead, if you reboot and lose your CFW, simply run the FastRecovery app from your Game menu to restore it in seconds. Why Upgrade? Upgrading from 3.52 M33 to 6.60 provides several benefits:
Game Compatibility: Play later-release UMDs and ISOs without needing "patches."
PSN Access: Better stability when connecting to the PlayStation Network (though services are limited today).
Plugin Support: Most modern PSP plugins (like CXMB for themes) are designed specifically for 6.60 or 6.61. model is compatible with the permanent CIPL Flasher?
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?
Game Compatibility: Older M33 firmwares cannot run newer PSP games or backups without tedious patching.
Plugin Support: While 6.61 is technically newer, 6.60 is widely considered better for compatibility with classic plugins and custom themes (CTFs).
Permanent Modern Modding: Reaching 6.60 allows you to install stable, permanent custom firmware like 6.60 PRO-C or ME (Minimum Edition). The Upgrade Story: From M33 to 6.60
The path from 3.52 M33 to 6.60 isn't always a straight line. Because the firmware is so old, modern updaters may throw errors if you try to jump directly. Step 1: Prepare Your Hardware
This is the safest way to leapfrog versions.