Upgrading a PlayStation Portable (PSP) from the ancient firmware to a modern 6.60 custom firmware (CFW)
Before we dive into the “how,” let’s discuss the “why.” 3.52 M33 is a 1.50 kernel-based firmware that relies on legacy loading methods. Here’s what you gain by moving to 6.60: psp 352 m33 upgrade to 660 portable
Because the gap between 3.52 and 6.60 is large, you cannot simply install the newest firmware. You must follow a specific upgrade path to ensure the PSP remains "hacked" (capable of running homebrew and ISOs). Upgrading a PlayStation Portable (PSP) from the ancient
Update to 3.52 M33-4: If you are on base 3.52, install the M33-4 patch first. Follow the on-screen prompts