[TUTORIAL] Switch: update Atmosphère and hekate safely

Step-by-step Nintendo Switch and Wii U tutorials: Atmosphère and hekate custom firmware, Aroma, backups, homebrews and safe updates.
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[TUTORIAL] Switch: update Atmosphère and hekate safely

Post by Tgames »

Automatically translated from French.

[TUTO] Switch : mettre à jour Atmosphère et hekate sans risque

Atmosphère and hekate are the two building blocks of the Switch's custom firmware. Updating them is simple, but the order matters: always update Atmosphère and hekate before the console's firmware, never the other way around.


Where do things stand (October 3, 2026)?
  • Atmosphère 1.12.0 (September 27, 2026) and hekate 6.5.4 / Nyx 1.9.4 (September 28, 2026) support firmware 23.0.0.
  • The 23.0.1 fix (September 30, 2026) is supported as well: you can update, once Atmosphère and hekate are installed in those versions.
  • Two pitfalls in this release: fusee-primary no longer exists and will no longer work, so you must use fusee.bin; and the hekate 6.5.4 archive was re-uploaded on September 28 at 15:30 UTC to fix a sleep bug — download it again if you took it in the first few hours.

Which Switch is affected?
  • Unpatched "Erista" Switch (first-generation Switch): boots into RCM mode, no hardware modification needed. Check the serial number in System Settings > System > Serial Information (more reliable than the sticker).
  • Switch V2 (Mariko), Lite and OLED: only with a modchip.
  • Switch 2: no custom firmware to date. A limited exploit was presented in July 2026, but nothing usable has been published.

What you need
  • The atmosphere-1.12.0-master-….zip and fusee.bin zip files (for RCM injection), from Atmosphère's official GitHub page.
  • The hekate_ctcaer_6.5.4_Nyx_1.9.4.zip zip, from hekate's official GitHub page.
  • A USB cable (RCM) or your modchip, and a PC.

Steps
  1. Make a backup copy of your SD card's contents on your PC.
  2. Boot into hekate (RCM injection or modchip).
  3. In hekate: Tools > USB Tools > SD Card to mount the SD card on the PC.
  4. Copy the contents of the Atmosphère zip to the root of the card, overwriting existing files.
  5. Copy the bootloader folder from the hekate zip to the root of the card.
  6. Safely eject the card from the PC, then tap Reload in hekate.
  7. Boot your CFW (sysMMC or emuMMC) and check the version in System Settings > System.
  8. If the console crashes on boot, first suspect system modules (sysmodules) that aren't yet compatible, such as MissionControl, ldn_mitm or themes: empty the relevant folders in sd:/atmosphere/contents/.
  9. Only afterward, and only if the firmware is supported, update the console's firmware.

What about the emuMMC?

The emuMMC has its own firmware, independent from the console. To update it without going through the Internet, extract the firmware (for example with TegraExplorer) then install it with Daybreak, the tool bundled with Atmosphère. Remember to keep Nintendo's server block (Atmosphère's DNS redirect file) active.


⚠ Warning: going online with a custom firmware risks getting your console banned by Nintendo. And on a console with a modchip, major updates should be done from the original firmware.


Sources and official guides: NH Guide: updating · Atmosphère · hekate · Compatible models

Tgames provides no games, BIOS, or keys: only use backups of your own games and your own console. Have a question? Reply to this thread.

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