atmosphere-firmware-update.zip

Turn off your Nintendo Switch and plug your SD card in your computer
Download the latest release of Atmosphere (on the link below)
Copy the contents of the Atmosphere .zip file to the root of your SD card
- If you are prompted to overwrite files, do so
(If your hekate is not on the latest version) Update hekate via the steps below
Put your SD card back in your Switch and launch CFW

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