Custom Firmware 3.71-M33 Released

Custom Firmware 3.71-M33 Released


3.71 M33 by M33=Dark_AleX

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.

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.

Installation instructions:

First method for both psp, the prefered when possible:

Requeriments: a fat psp slim with 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.

– Copy the UPDATE directory into /PSP/GAME/UPDATE and copy the EBOOT.PBP of the 3.71 Sony updater
there but with name “371.PBP”. Note: the program will not even show if you copy it to a different folder than that.

– If you are in the fat psp, make sure you have configured the psp to run the game folder in the 3.XX kernel.

– Execute the program, it requires 78% of battery. If you have idstorage corrupted due to a downgrader, the program
  will ask you to correct it automatically so the update can continue.

– Press X, and the Sony updater will begin. Sit and enjoy while Sony code installs 3.71 M33 🙂

– When finished, the updater will ask you to reboot (pressing X or O). DO IT. Do not skip this step
shutting down the psp by yourself, or you’ll end with a brick.

– You should be now in 3.71 M33

Unbricker for both psp slim&fat and 1.50 kernel installer for fat 3.71 M33, will be released in few days… and it will be last thing from me.


오~ 드디어 나왔습니다.
일단 추석 지나고…


[#M_more..|less..|Dark_AleX never breaking a promise ? yesterday the Universal Unbricker, and now the long awaited 1.50 kernel patch for custom firmware 3.71 M33… Well not that long, its only been out a week now.


  • Install 3.71 M33 (if you haven’t already)
  • Copy the directory UPDATE to /PSP/GAME/UPDATE.
  • Get sony 1.50 update and copy it to the root with name “150.PBP”
  • Run the program and done.


  • This program is only for PSP fat. The program will reject PSP slim, due to the 1.50 kernel not working on it.
  • Because of lack of space, the installer will remove Location Free Player, and the korean font
M33의 3.71이 3.xx 커널을 이용하기때문에 1.5 커널 기반의 홈브류의 작동에 문제가 있었나보군요.
그리해서 1.5커널 애드온을 만들어 배포하는군요.

그럼이제 이 녀석으로 옮겨타도 될런지…
일단 조금더 지켜보도록 해야겠군요.

M33의 3.71 update#2 가 나왔군요.
그리고 1.5 커널 애드온#2 업데이트도 있습니다.

뭔가 아직 완성이 안된듯한 버젼이랄까요…
이대로 끝나버리는 것일지..

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