A step-by-step guide on how to run Heroes 5.5 on Steam Deck

Since I don’t own STEAM Deck, I can’t verify the functionality of this guide, but if anyone has it and manages to install Heroes 5.5, be sure to send photos.


  • Install HoMM5: Tribes of The East on Steam Deck
  • Start the game once, so proton compatdata folders are created
  • Install Protontricks from the Discover store
  • Download Heroes 5.5 mod on Steam Deck
Might & Magic: Heroes 5.5
Heroes 5 Bundle GOG (works with this version)
see discord server for large database of compatible maps (most maps from maps4heroes.com have to be edited to work properly)

Steps to configure:

1. Open terminal (Konsole) and run the following commands to create commands aliases:

echo "alias prot" >> ~/.bashrc
echo "alias protontricks-launch='flatpak run --command=protontricks-launch com.github.Matoking.protontricks'" >> ~/.bashrc

Note: This step is optional, it’s going to create commands aliases, so instead flatpak run –command=protontricks-launch com.github.Matoking.protontricks you can do protontricks-launch

2. Restart the terminal so that the above aliases take effect

3. Create the game folder inside the compatdata directory, so that the installer can find it:

ln -s ~/.steam/steam/steamapps/common/Heroes\ of\ Might\ and\
Magic\ 5\ Tribes\ of\ the\ East/bin

4. Start mod installer and when it asks to select the game directory, find it in C:\Heroes of Might and Magic 5 Tribes of the East

protontricks-launch --appid 15370 ~/Downloads/MMH55_RCXXx.exe

Note: Replace XXx with the name of the mod version your are installing. For example MMH55RC17h.exe

5. Browse the path of the game:

cd ~/.steam/steam/steamapps/common/Heroes\ of\ Might\ and\ Magic\ 5\ Tribes\ of\ the\ East

6. Backup original exe:

mv H5_Game.exe H5_Game.exe.backup

7. Set MMH55_64.exe as default one:

cp MMH55_64.exe H5_Game.exe

8. Launch the game from Game Mode.

– Game start fails with error “Failed to set display mode” – Game is probably launched in desktop mode which is not working. Try running it from Game Mode. If you manage to make it run from Desktop Mode please provide us the steps so we can update the guide.

Source: https://www.moddb.com/mods/might-magic-heroes-55/tutorials/mmh55-running-mmh55-on-steam-deck

Heroes 5.5 is an unofficial expansion pack for Heroes 5 Tribes of the East (standalone) or HOMM5 Complete. The pack will include many new adventure objects, new larger battlefields, new heroes, new classes, new specializations, new skills, new artifacts, new adventure spells, new HD textures and a greatly improved RMG with more than 60 ‘visualized’ Templates. The AI is much more intelligent and calculated much faster. Balance is also greatly improved both for small competitive multiplayer maps as well as crazy XXXL maps with countless epic battles vs Neutrals and AI.


  1. Grammar papa

    Sorry to say that but this tutorial is inferior to the original one mentioned in the source. Add spacing after each line of code, separate code lines, make sure user knows where is the space in the code and for the love of all, change the font. The ” symbol looks like * symbol.

    The “Open Terminal” step is a bunch of lines mushed together using copy-paste. Fix it so that we know when the code ends and comment starts.

    I can’t believe that this article hangs there since March 6th and you did not even check if it’s properly written.

    1. Liso1 (Post author)

      Fixed, thank you very much.

      As I wrote, I don’t have a STEAM Deck and I didn’t know how to try this tutorial, so I just copied it. But I copied it very badly. Thank you for the correction.


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