Yesterday I was installing a new speaker selector and bumped the USB extension cable holding my Zooz 800 controller. It took me until late evening to notice that all my Z-Wave devices were unresponsive. There were some tense moments as unplugging and replugging the contoller stick, as well as several HA restarts, were insufficient to resolve the “Driver: Failed to open the serial port” message from zwavejs-ui. Nothing short of a complete power cycle did the trick, but fortunately for me that worked and thus avoided a minor catastrophe at bedtime.
That got me wondering what I would have done if the 800 completely failed. I still have the 700 stick I was using before I got the 800. Can an 800 series Z-Wave controller network backup be restored to a 700 stick or only to another 800?