No. You must upgrade to 3.52 M33-4 first before proceeding to 6.60 OFW. This intermediate step is necessary for a stable update path.
Follow these steps carefully to upgrade your PSP from 3.52 M33-4 to 6.60 PRO-C:
While 3.52 M33 was a staple of the PSP hacking scene, it is now outdated. Upgrading to 6.60/6.61 Custom Firmware (CFW) provides: psp 352 m33 upgrade to 660
| 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) |
Ensure you know if you have a PSP-1000, 2000, 3000, or Go. Follow these steps carefully to upgrade your PSP from 3
Better battery management and faster file browsing. Prerequisites: Before You Begin
On the PSP, go to and run the 6.60 Update. 4. Installing Modern Custom Firmware (6.60 PRO or ME) Prerequisites: Before You Begin On the PSP, go
This guide provides a comprehensive walkthrough for upgrading your PSP safely to custom firmware 6.60, 6.61, or higher, ensuring you retain full custom firmware capabilities. Why Upgrade from 3.52 M33?
Disconnect the USB, go to the menu on your PSP, and run the 3.52 M33-4 update.
Ensure you have a reliable Memory Stick Pro Duo (or a MicroSD to Pro Duo adapter) with at least 512MB of free space.
Custom Firmware (CFW) 6.60/6.61 is more stable and versatile. Important Pre-Upgrade Checklist