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Document ID: PSP-CFE-2025-01
Version: 1.0
Target Audience: PSP enthusiasts, retro console modders, firmware analysts
Hold the Right Trigger (R) while powering on to enter the Recovery Menu.
The PlayStation Portable (PSP) homebrew scene underwent a significant evolution between 2007 and 2011. The 3.52 M33 custom firmware (CFW) by M33 team represents the "middle ages" of PSP hacking, while 6.60 PRO-C represents the mature, final standard. This paper documents the procedural challenges, dependency resolution, and risk mitigation strategies required to safely upgrade a legacy 3.52 M33 device to modern 6.60 CFW without bricking the device. psp 352 m33 upgrade to 660
Depending on your motherboard:
Because 3.52 M33 is a legacy firmware from 2007, you cannot simply "hop" directly to a modern CFW without first returning to a stable official baseline. How to update from custom firmware 3.52 M33 to 3.52 M33-4 Technical Paper: Legacy to Modern – Upgrading PSP
Once on OFW 6.60, you can install a modern, stable CFW like 6.60 PRO-C2. Download the PRO-C2 files. Copy the PROUPDATE and FastRecovery folders to PSP/GAME/. Run PRO Update from the Game menu and press X to install.
We must return the console to a blank slate before installing modern custom firmware. How to update from custom firmware 3
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.
Transfer Folders: Copy the PROUPDATE and FastRecovery folders from the download into your PSP's /PSP/GAME/ directory.
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