If you still have access to the old BRAIN: It is best to remove the NODEs individually in the app (side menu -> My REVOTION system -> On the respective module -> At the bottom of the configuration) and then add them to the new one. This allows the configuration to be retained and saves you having to search for the modules. The NODE simply has to be added to the new BRAIN.

No more access to the old BRAIN: The NODEs have a reset button. This must be pressed (hold for 5 seconds). This resets the NODE and it can then be added to the new BRAIN.