While this guide has been tested and is unlikely to cause any data loss, please still make sure to back up your 24 words and download a channels.backup before continuing.
Open a Terminal on your computer (on Windows, it may be called "Windows Terminal" or "PowerShell").
Type the correct command for your operating system into the terminal and press enter:
Windows & Linux: ssh umbrel@umbrel
MacOS: ssh umbrel@umbrel.local
When asked for your password, enter the password from Umbrel's dashboard.
Now that you're logged into your Umbrel, copy & paste this command and press enter:
sudo ~/umbrel/scripts/update/update --repo runcitadel/umbrel#master
Your dashboard should now display a message that you can safely shut down your node. To do that, enter this:
sudo shutdown now
Back on your computer, download Citadel OS from runcitadel.space/go/download.
Also download Balena Etcher if you don't have it installed already.
Remove the SD card from your Pi, plug it into your computer and flash the downloaded Citadel OS .zip file on the SD card using Balena Etcher.
Put the SD card back into the Pi and boot it. After a short while you should see the dashboard at http://citadel.local