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Correct you need the pro bridge.
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Not sure.. did you check the compatible items list? List of Compatible Devices - Hubitat Documentation
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Have several. Work under the Generic Z-Wave Driver. But there is also a custom Driver out there, which I have found works better. Edit Here is the driver. Support of OTA firmware updates for Z-Wave / Z-Wave Plus devices
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I know I have seen discussion on this one, some searching on the topic should get you what you need.
5&6.. Sorry I'm no help.