Ensure ISOs are in ms0:/ISO/ folder (uppercase "ISO") with proper filenames (no special characters). UMD ISO Mode should be set to "Sony NP9660" in VSH menu.
In the annals of handheld gaming history, few devices sparked a "cat and mouse" game quite like the Sony PlayStation Portable (PSP). At the heart of this legend lies the transition from the golden age of "M33" custom firmware to the modern stability of the 6.60 era. Upgrading a PSP from version to 6.60 is more than a simple software patch; it is a journey through the evolution of digital sovereignty. The Legend of M33 and Dark_Alex
Some very old saves from 3.52 M33 may show as “Corrupted Data” on 6.60. Use or Savegame Deemer to re-decrypt and re-encrypt them for 6.60. psp 352 m33 upgrade to 660
When upgrading, you generally have two options. The "M33" lineage effectively ended years ago, so you will be moving to a different custom firmware architecture.
Your hardware is now completely modernized. You can take advantage of several modern conveniences: Ensure ISOs are in ms0:/ISO/ folder (uppercase "ISO")
Old 3.52 M33 plugins ( .prx files) will work on 6.60. You need to redownload 6.60-compatible versions:
You still cannot jump from 3.52 M33-4 straight to 6.60. Modern official update files will throw a "DR-9000" or similar error code. You must install to bridge the kernel gap. At the heart of this legend lies the
PSP-CFE-2025-01 Version: 1.0 Target Audience: PSP enthusiasts, retro console modders, firmware analysts
A: This indicates IDStorage corruption. Use Hellcat's Recovery Flasher to flash 5.00 M33-6, then attempt the OFW update again.
Rationale: 5.00 M33-6 includes the version.txt spoofing required to bypass Sony’s 6.xx battery check.
Released by Team M33 in 2007, 3.52 M33 was a revolutionary custom firmware (CFW) for its time, but it has major limitations today: