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Zones and devices are bound to your license key. Changing your license key will remove all of the current zones and devices (including their backups!) from your Unimus system and add the zones and devices from the new license key into the system. If the new license key is empty - this means that the Zones and Devices (and their backups) in your Unimus will disappear, and you will be left with an empty system. Settings like credentials, schedules or Config Push presets are not affected.