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Install PSP Custom Firmware 5.50 MHU

If you’re still looking for a Dark Alex release of 5.50 custom firmware tough luck. The good news is that members of team M33 has released their version of 5.50 much like what they did with 5.03 (5.03 MHU A.K.A. Custom Firmware Enabler). Do note that this custom firmware is for PSP-1000 / non-TA088v3 PSP-2000’s.

Important: DO NOT attempt to install this on PSP-3000 / PSP-2000 TA088v3. YOU WILL BRICK YOUR PSP IF YOU DO.


How to install 5.50 MHU CFW on your PSP:

  • Extract the MHU files to your computer.
  • Copy the PSP folder to your PSP’s memory stick. (Yes, just drag the whole folder there)
  • Extract the 550.pbp files to your computer.  Rename it (the file’s name is EBOOT.pbp) to SCE.pbp.  This is important!
  • Copy the SCE.pbp to X:PSP\GAME\UPDATE folder
  • Disconnect the PSP from USB.
  • Run 5.50 UPDATE from under Game on your PSP’s XMB
  • After all process is complete, press X. Your PSP will reboot.
  • Congratulations, you’ve just installed 5.50 MHU

Important Notes:

  • Always use the M33 driver. The SonyNP9660 driver doesn’t work.
  • Update network doesn’t work. It will get the official firmware so don’t use it.

What do I get with Custom firmware 5.50 MHU?

  • All functions of the official 5.50 firmware
    • The [Information Board] has been added under [PlayStation Network]
    • PS3 owners are already familiar with this feature. It displays news and updates from SCEE in the upper right corner of the screen. You can now obtain information about the games ahead of the new content available on the Playstation Store, and other news from your PSP even if you are connected to WiFi.

    • Support for Internet security service provided by Trend Micro has been added to [Internet Browser]
    • End Micro Web Security: use technology to block access to malicious sites that can steal personal information and confidential –
      Trend Micro Kid’s Safety: You can block access to websites with inappropriate content.

    • An icon for built-in Internet Search has been added to the menu bar of your browser
    • Instead of having to point your browser to Google then search, you can do your searches directly on your XMB.

    • Option to search for the game title on Google.
    • By selecting the icon of the game and then pressing triangle and selecting running Internet Search, you get to search for sites using the name of the game.

    • It is now possible to see an additional level of hierarchy under [Photo] [Music] and [Video]
  • Launch of UMDs to ISOs to CSOs and demos require firmware 5.02 or below
  • Launch homebrews
  • Launch of PS1 games (converted to PSP)
  • Access to Recovery mode (adjusts the processor speed of the PSP, FLASH access, use plug-ins etc.).


Dark_AleX – For his M33
Genyus – By GEN

Post a comment if you need help or clarifications.

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Comments ( 27 )

Have Something To Say ?

  1. kric kric September 13, 2009 Reply

    it works ! thanks

  2. tanto_real_97 tanto September 14, 2009 Reply

    kabayan me again! mas ok b toh kesa s 5.00 m33-6? thanx!

    • atmaxplorer sylv3rblade September 19, 2009 Reply

      If habol mo ung PSN games na ito ang requirement. Otherwise I suggest sticking to 5.00 M33

  3. cloud1680 cloud September 19, 2009 Reply

    It worked. But all my games can’t load after I upgrade.. Screen black out after game startup..Pls help

    • atmaxplorer sylv3rblade September 19, 2009 Reply

      Have you tried changing the ISO mode? (press select on the XMB)

  4. cloud1680 cloud September 19, 2009 Reply

    already changed to M33

  5. cloud1680 cloud September 19, 2009 Reply

    How to downgrade to lower version

  6. tanto_real_97 tanto September 20, 2009 Reply

    kabayan…if i try this? pede ko pa bang ibalik sa 5.00 M33 ang firmware koh? thanx…

    • atmaxplorer sylv3rblade September 20, 2009 Reply

      Yep. Puntahan mo lang ung link na bingay ko kay cloud 😀

  7. tanto_real_97 tanto September 20, 2009 Reply

    i’m a little bit confuse… i can still use my pandora battery to return to 5.00 M33… am i right? thanx…

    • atmaxplorer sylv3rblade September 20, 2009 Reply

      Yep. Pero if you don’t have pandora, the Hellcat’s recovery tool will do fine.

  8. cloud1680 cloud September 20, 2009 Reply

    Hellcat’s recovery tool part cant load as well. screen black out…pls help

    • atmaxplorer sylv3rblade September 20, 2009 Reply

      Looks like you need to reflash your PSP with a pandora battery.

  9. tanto_real_97 tanto September 20, 2009 Reply

    thanx kabayan… i will try this
    god bless u!

  10. razingpancakes hurp September 21, 2009 Reply

    Wah wala pa for slims T_T. Oh well, will wait nalang.

  11. jetrox9 Jet October 2, 2009 Reply

    anu meron sa CFW na ‘to sa 5.50 Gen-A & B?

  12. jetrox9 Jet October 2, 2009 Reply

    anu pagkakaiba n2 sa 5.50 GEN A & B?

  13. sweeneychill daniel October 19, 2009 Reply

    tol, pwede ko ba install sa psp ko to:

    5.00 m33-6
    PSP – 2006 model

    kaya ba nian un? hindi ba mabribrick?

    • atmaxplorer sylv3rblade October 19, 2009 Reply

      basta hinde nawawala ung CFW mo kapag pinatay mo ung PSP mo (off inde standby) pede yan.

  14. sweeneychill daniel October 20, 2009 Reply

    panung nawawala? hm d ku maxadong gets…salamat..=)

  15. up.n.down171 SDA_171 November 20, 2009 Reply


  16. devil_clan05 adeth March 30, 2010 Reply

    pano ko malalaru ung tekken 6 eh db 5.50 lang un?? 5.51 kasi ung version ko and psp 3k pa xa. panu po to??? help??? my brother updated it sa wifi then mag 1 year nako di makapaglaro since binili ko ung psp ko. help people!! 🙁

  17. AYS Gus April 28, 2010 Reply

    I try this and get the error
    Game cannot be started 800200001
    please help

  18. iamafukun iamafukun June 29, 2010 Reply

    I can’t seem to get this working on my PSP (slim, cfw 3.71 m33), it states when I run the program that my battery needs to be 78% and I’m sure that it is. Any help for this would be appreciated.

    btw I love Mio, excellent character

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