Psp 352 M33 Upgrade To 660 Portable May 2026

If you are still running 3.52 M33, you are using a Custom Firmware (CFW) from 2007. Upgrading to 6.60 is highly recommended. It allows you to play games released after 2007 without patching, improves system stability, adds support for the PSN Store (via specific plugins), and supports larger memory sticks.

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).

Now we turn that official firmware into a permanent custom firmware.

To make it permanent: Run the "CIPL Flasher" application from the Game menu.

Your old ms0:/ISO/ folder still works. However, your old 1.50 kernel homebrew (those apps with two folders %__SCE__ and __SCE__) will not work on 6.60. psp 352 m33 upgrade to 660 portable

If you’ve dusted off your old PlayStation Portable and seen the familiar "3.52 M33" splash screen on boot, you are holding a piece of history. The M33 series (created by the legendary team M33) was the gold standard of PSP custom firmware back in the late 2000s.

But let’s be honest: 3.52 M33 is ancient. It lacks support for newer games, PSN features, and modern homebrew.

Today, we’re going to take your vintage CFW and launch it into the modern era with 6.60 PRO-C, one of the most stable, feature-rich, and compatible custom firmwares available. If you are still running 3

Warning: This process involves writing to the PSP’s flash memory. While safe if followed correctly, always ensure your battery is 100% charged and your AC adapter is plugged in.

Once your PSP reboots into 6.60 PRO or ME:

Moving from 3.52 M33 to 6.60 is like upgrading from Windows 98 to Windows 10. The interface is familiar, but the backend stability, driver support (plugins), and software compatibility (games) are vastly superior. While the M33 legacy will always be respected, 6.60 PRO/ME is the definitive end-of-life firmware for the PSP. To make it permanent: Run the "CIPL Flasher"

You cannot install 6.60 PRO-C directly over 3.52 M33. First, you must update to Sony’s official firmware.

If you own a PSP 1000/2000/3000 with a custom firmware (CFW) like the M33 series and want a modern, portable-feeling experience by moving up to a 6.60-based release (6.60 PRO/PRO-C or similar), this post walks through the motivation, what to expect, and a practical, low-risk path. This is written for hobbyists who want a cleaner, more compatible firmware experience while keeping their PSP fully functional for games, homebrew, and media.