A Salvador can be unpaired from a Casambi network using the same method as any other Casambi device. Please see the user guide for more information.
From "Nearby devices":
From "Gateways" section (slide to left):
Note: Unpairing a Salvador will also remove all DALI luminaires that have been discovered by that Salvador. Network configuration related to luminaires controlled by Salvador is also lost when Salvador is unpaired.