The PlayStation Portable (PSP) homebrew scene evolved through multiple custom firmware (CFW) generations. Dark_AleX’s 3.52 M33 series (circa 2007) was a revolutionary CFW that allowed unsigned code execution. However, modern game releases (e.g., Fate/Extra , Brandish: The Dark Revenant ) and PSN features require firmware 6.60 or higher. This paper details the step-by-step upgrade path from (the final evolution of the M33 branch) to 6.60 PRO-C2 or 6.60 ME-2.3 , including technical prerequisites, risk mitigation, post-upgrade changes in NAND layout, and compatibility matrices.
However, the PSP scene has evolved significantly. Staying on 3.52 M33 today limits your ability to play games released after 2007, prevents you from using the PSN Store (historically speaking), and blocks access to modern homebrew engines like the popular gPSP Kai (GBA emulator). psp 352 m33 upgrade to 660
Go to and find the option for "Use VSH Menu" . Set it to "VSH Menu". This paper details the step-by-step upgrade path from