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Changelog

Atmosphere

Atmosphère is a work-in-progress customized firmware for the Nintendo Switch.

Atmosphere-NX/Atmosphere

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NewSeptember 3, 2025

Atmosphère 1.9.4

1.9.4 is Atmosphère's eighty-fifth official release.

Please be sure to update fusee when upgrading to 1.9.4. fusee-primary no longer exists, and will not work any more.

With thanks to the @switchbrew team, Atmosphère 1.9.4 is bundled with hbl 2.4.4, and hbmenu 3.6.0.

The following was changed since the last release:

Basic support was added for 20.4.0.
- An issue was fixed in exosphère's register accessilibity tables (thanks @CTCaer).
  - I believe this had no impact on official code, though it would have prevented some homebrew from interacting correctly with the MC0/MC1 registers.

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Basic support was added for 20.0.0.
- The console should boot and atmosphère should be fully functional. However, not all modules have been fully updated to reflect the latest changes.
  - There shouldn't be anything user visible resulting from this, but it will be addressed in a future atmosphère update.
  - The same action item from 18.0.0 remains, and I believe in my heart of hearts that it will be addressed eventually. Someone has told me they're working on it.
  - There aren't (to my knowledge) outstanding 19.0.0 items any more.
- Please note: As a result of changes made to nintendo's software in 20.0.0, there is roughly 10MB less memory available for custom system modules.
  - We can only steal a maximum of 14MB from the applet pool, down from 40MB.
  - To compensate for this, ams.mitm's heap usage has been reduced by 20MB.
    - To facilitate this, a new helper module (memlet) was added, so that memory may be temporarily stolen during the romfs building process.
    - Hopefully, this results in relatively little breakage, however it is possible that user mods which replace extremely large numbers of files in The Legend of Zelda: Tears of the Kingdom may no longer function.
      - If you are affected by this, you will see "Data abort (0x101)" when trying to launch the game with mods.
      - Please reach out to sciresm on discord if this occurs to share your error report binary. However, some issues may be impossible to fix.
      - I apologize sincerely if the issue is impossible to resolve, but I have been forced unavoidably to make compromises here, and I think this is the best balance to be struck.
- exosphère was updated to reflect the latest official secure monitor behavior.
- mesosphère was updated to reflect the latest official kernel behavior.
- loader was updated to reflect the latest official behavior.
- pm was updated to reflect the latest official behavior.
- ncm was partially updated to reflect the latest official behavior.
- erpt was updated to reflect the latest official behavior.
Atmosphère was updated to use GCC 15/newlib (latest devkitA64/devkitARM releases).
A number of improvements were made to the dmnt cheat engine.
- New instructions were added, and instructions were updated for improved/new functionality.
- Please see the documents for details -- thanks @tomvita!
General system stability improvements to enhance the user's experience.