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Install PSP Custom Firmware 5.00 M33 Prometheus add-on

With 5.03 GEN-C and 5.50 GEN-D3 getting their own respective Prometheus (5.50 GEN Prometheus and 5.03 GEN Prometheus) plugins that will allow them to play games that require Sony’s 6.20 OFW and above, can the M33 guys who still stick to Dark Alex’s legacy custom firmware get some love?  Apparently yes as Red Squirrel has released a 5.00 M33 Prometheus plugin for all you folks that stick to this stable yet admittedly outdated firmware.

Who was it that said that the M33 firmware is dead?

This release will install on all hackable PSPs that has 5.00 M33 firmware (and it’s subsequent patches up to 5.00 M33-6).

Important: This only for hackable PSPs. Not sure? read: Is my PSP hackable?

Update: The Prometheus-3 add-on is now available.
Important: If you have firmware above 5.00 (5.03 or 5.50 in example) you need to downgrade your PSP to 5.00 M33.


  • A PSP with custom firmware 5.00 M33 installed (preferably 5.00 M33-6). If your firmware version is below this, please update to 5.00 M33.
  • PSP battery that’s at least 78% full
  • Download:
  • Disable ALL plugins.
  • Back up your save files (so that if they get corrupted, you still have backups)

How to install 5.00 M33 Prometheus add-on

  • Connect your PSP to your computer
  • Extract the to your PC
  • Copy the M33-Prometheus Installer folder to X:/PSP/GAME/ on your PSP’s memory stick. (Where X is the drive that your PC recognizes your memory stick)
  • On your XMB, go to Game > Memory Stick, hold the L trigger and press X to start 5.00 M33 Prometheus Updater
  • Continue to install the official 5.00 M33 Prometheus CFW when prompted
  • After all process is complete, press X again. Your PSP revert to the XMB screen.
  • Congratulations, you’ve just installed M33 Prometheus add on on your 5.00 M33.

Important: This release is currently M33 Prometheus v2. Stay updated by subscribing to our feeds.
Update: The Prometheus-3 add-on is now available.
After installing 5.00 M33 Prometheus, How about some Free PSP Games?


In case of problems you can go back to 5.00 M33 by simply running the installer for 5.00 M33 again.

You can post problems you’ve encountered here.

Developer Notes:

What’s it?
It’s a simple PSP homebrew that installs the MOD Prometheus in your CF 5.00M33-6.
It does all the necessary to enable the MOD Prometheus in your CF such as writing prometheus_lite.prx in Flash0, Prometheus_key.txt in Flash1 and Stargate.prx in SEPLUGINS folder and adding the Stargate.prx plugin string in your GAME.txt
From v2.0 it has also a function to write all files in your Flashs, in this way you won’t loose a place in GAME.txt!

-If you use the KHBBS plugin remember to disable it before to use this program, otherwise it can’t write files in flashs correctly.
-Be carefull to use the “All in Flashs installation”, because (if something goes wrong!) it could bring your PSP in a semibrick status!
-The program adds the Stargate.prx plugin string in first position in your GAME.txt (if it exists!). So other plugins (if present) will be saved from second position (you won’t loose them!).
-When you uninstall the MOD prometheus with the specific function of this program the GAME.txt file will be completely deleted. So you will loose all plugins enabled in GAME.
-The program does not recognize the CF version, for this reason it works in any Custom Firmware: be sure to use it ONLY in CF 5.00M33-6!


Red Squirrel for the Prometheus add-on
To the Prometheus plugins and MODs coders.
To Dark_Alex for his CF and VLF libraries.

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Comments ( 47 )

Have Something To Say ?

  1. marcelossarmento Marcelo October 16, 2010 Reply

    Hello! Thanks for this add, but a heard that this plugin has a problem with the saves, that some will apear as corrupted. What’s this all about?

    • atmaxplorer sylv3rblade October 16, 2010 Reply

      Sometimes, when upgrading your firmware, the savefiles get corrupted which is why it’s adamant that you create a backup before upgrading.

  2. bfebrianto Benyamin October 26, 2010 Reply


    i’m not an expert in this kind of thing, and i bought my PSP already hacked.

    My firmware is 5.00 M33-6 (checked via Settings>System Information)

    for the motherboard version (checked via PSPIdent 0.4) is TA-085

    is it safe for me to use the prometheus installer?


    • kacperdsghu psph4ck3r May 20, 2011 Reply

      yes,it’s safe

  3. manjit5 manjit November 1, 2010 Reply

    hi i have psp 3006 with firmware 6.20 and i want to hack there any solutions please help

    • atmaxplorer sylv3rblade November 1, 2010 Reply

      There’s someone working on a 6.20 CFW at the moment, I would suggest waiting for more news on that before installing any further updates.

  4. a.i.chopra flamebeast November 23, 2010 Reply

    how can i disable the plugins???

    • atmaxplorer sylv3rblade November 24, 2010 Reply

      You can disable them via the recovery menu

  5. slisjack Bojack December 15, 2010 Reply

    I am having trouble getting Prometheus to install on my psp. I am using 5.00 m33-6 and I grabbed the correct Prometheus for it, but it keeps giving me this error, ” 5.00 m33-6 needed”. Any help? Thanks

    • atmaxplorer sylv3rblade December 16, 2010 Reply

      What’s your PSP model?
      Are you sure it’s running 5.00 M33-6 CFW and not the pseudo cfw via chickhen?

      • slisjack Bojack December 22, 2010 Reply

        I have a PSP1000 (straight from launch). It’s the actual 5.00 m33-6, no Chickhen

        • atmaxplorer sylv3rblade December 24, 2010

          Hmm that seems odd,
          Try reinstalling 5.00 m33-6 then run the installer for prometheus again.

    • asmodeus98 asmodeus April 3, 2011 Reply

      this happenned to me too, i was placing the installer in the wrong folder, try the foleder psp/game or psp/game5xx

  6. sayemahmed1995 Dunno February 24, 2011 Reply

    go you have to start from v1
    or straight from m33-6 to vM33-Prometheus 3

    • atmaxplorer sylv3rblade February 24, 2011 Reply

      You can go straight to Prome-3 (or even Prome-4)

  7. sayemahmed1995 dunno February 27, 2011 Reply

    on sys info it still the same 5.00m33 6

  8. amir.tcsc critical March 2, 2011 Reply

    i have 5.00 m33-6
    and i have download prometheus-4

    WHEN i open the homebrow , i get this
    press R to exit
    press X to install

    and by presing x after some other massages, i’ll get a install ok massage
    but i still see 5.00m33-6 under my system information! what should i do?

  9. amir.tcsc critical March 2, 2011 Reply

    i’ve forgot to say… cuz when i open psp homebrow
    it say premetheus-3 thogh i have dl pre-4
    why is it like that?! :s

  10. amir.tcsc crritical March 9, 2011 Reply

    i have serch google for pr-4 5.00m33, but there is nothing a bout it! is it only avalable for gen-d3?

  11. afzal4fr Afzal Khan April 3, 2011 Reply

    Soooo easy to do!!! Installed Prometheus 4 on my PSP Slim 2004. Finally i can play all the new gamez i downloaded. Keep up the good work

  12. cmarlon2266 marlon April 7, 2011 Reply

    i have psp it posible to install it wit cfw loader?waiting for your response blade..thanx..

    • atmaxplorer sylv3rblade April 7, 2011 Reply

      All 6.xx Hen are compatible with the PSP Go. I myself am using 6.20 TN-D 🙂

      • cmarlon2266 marlon April 7, 2011 Reply

        how can i install a cfw?please give me the sigth where i can download it.and the instructions how to install it..thanx..

  13. cmarlon2266 marlon April 8, 2011 Reply

    i have psp go 6.37.what cfw should i install?

  14. cmarlon2266 marlon April 8, 2011 Reply

    kindly help me..i already install prometheus iso loader but has a error.. THE GAME IS CORRUPTED. what loader is compatible with psp go 6.37? help me plz blade..

    • atmaxplorer sylv3rblade April 9, 2011 Reply

      Please check if you have Hen installed. Also, post here what your PSP’s exact firmware version

  15. cmarlon2266 marlon April 10, 2011 Reply

    i am loading hen 6.20,extracted the patapon 2 demo but when i load the game LOADING FAILED. THE DATA IS CORRUPTED.what should i do..

    • atmaxplorer sylv3rblade April 11, 2011 Reply

      Your PSP is 6.37 OFW right? You can’t use 6.20 Hen because it requires that your PSP’s to be exactly 6.20 OFW

  16. cmarlon2266 marlon April 11, 2011 Reply

    yes my psp is what Hen can i use with my psp?

    • atmaxplorer sylv3rblade April 11, 2011 Reply

      There is no Hen for 6.37. Only Homebrew loader: 6.37 HBL. WIth this HBL, you can run Homebrew applications but not ISO games.

  17. cmarlon2266 marlon April 11, 2011 Reply

    what do you mean by homebrew applications? im a new user of psp thats why i dont have any knowledge about it..kindly explain further,,thanx..

    • atmaxplorer sylv3rblade April 11, 2011 Reply

      Homebrew means apps that have been created by the community.

      • cmarlon2266 marlon April 14, 2011 Reply

        thanks a lot for the info….

  18. dodokh.ali Ali May 27, 2011 Reply

    Hi ,
    i have problem ! when run the installer its work but the give me a error msg this is me psp screen
    “5.00 prometheus-3 by [email protected]
    Press X to install CFW.
    Press R to exit.
    PSP FAT 100 Detected …
    Install…copy file (0x0001001c)! Install aborted.
    Press X to exit
    So whats wrong ?
    Plz help

  19. eigzz369 arjpogi May 29, 2011 Reply

    hi!. i’ve just installed the prome-4 successfully but when i started my games, it doesn’t seem to load properly and shuts down my psp. anything i have done wrong so far? i followed the step by step process anyway. it also happens when i try to re-run the prome-4.

    psp 2000
    5.00 m33-6

  20. cmarlon2266 marlon May 30, 2011 Reply

    i have psp 3001 with 5.03 gen-a (full) what iso loader should i use to run iso and cso games?i cant play any iso and cso games..thanx…

  21. mohammedrashin8 rasheen August 14, 2011 Reply

    i have installed the add :)…but after installin i dont get the prometheus iso loader.. plz HELP!!!!!!

  22. mr.solo.dolo7 ahmed October 9, 2011 Reply

    hi iam using a psp 1000 model and have 5.00m33 6 cfw. i tried installing the mod and it gave me two options classic and flash i tried flash and th new games still did not work then i tried classical and the new games still didnt work i wanted to uninstall it but now nothing loads when i try to click it on the games screen help please

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