The wait is over and Team M33 has released custom firmware 3.71 M33!

However, 1.50 kernel enabled homebrew will no longer work because the main installer won’t install the 1.50 kernel anymore. But don’t worry as a 1.50 kernel addon will be released in a few days (for fat only).

Changes in 3.71 M33:

• Now uses 3.71
• VSH Menu is not longer launched using HOME key, but using SELECT now. This is to not interfere with the XMB function of home, which is now more useful in this firmware.
• Psp Slim: umdcache was allocating memory even when homebrew was launched, wasting memory that homebrew programs may want to use. Now umdcache module is stopped before it can allocate any memory, only in the case homebrew is launched.
• Also, memory is unprotected for user memory usage by M33 core (only when homebrew is launched). Developer, for a sample of how to use the extra memory, see the extra ram sample of the M33 sdk.
• Both version boot now from 3.XX ipl, and are independent of 1.50.

Additional important notes:

The main installer will not install 1.50 kernel anymore.
A 1.50 kernel addon for 3.71 M33 that will install inside 3.71 M33 will be released in a few days (for fat only)

Note: due to some changes in kernel nids by Sony, you can expect a lot of kernel plugins not working anymore.
Programmers: refer to the sdk readme for details.

A fat PSP with custom firmware 3.52 M33-3 or 3.52 M33-4. Previous versions of M33 won’t work due to a bug that affects them and OE; or a PSP slim with 3.60 M33. Installation instructions can be found in the readme.

Well if you thought that was great news (and it was), Dark_AleX states that he is M33. A new unbricker for both the PSP Slim and fat will be released along with a 1.50 kernel installer for 3.71 M33 (fat PSP only). Unfortunately, he states that this will be the last thing from him.

Download: Custom Firmware 3.71 M33
Discuss: PSP Hacks Mods Forums

[Source: M33]