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it probably doesn’t need to be. Right now that’s pretty rare for Z wave devices, as the OTA option was only added last year and most manufacturers aren’t using it yet. If there’s a critical update and no way to do it, if you’re still under warranty most manufacturers will just swap your device for one that’s current. But like I said, firmware updates have been rare for zwave devices anyway.
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The smartthings hub does not as yet support the new OTA feature for zwave. They’ve said they’re looking into it, but who knows what that means.
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you can get the third-party Homeseer kit and do zwave OTA updates that way, but again most device manufacturers aren’t providing the files that are required for the updates. It’s a new feature, and it just isn’t being used much yet. Homeseer does use it for their own devices, and a few other companies, notably Leviton, have given homeseer update files to use with their kit. But GE/Jasco has not provided anyone with update Files yet.
Much discussion of all three of these points in The following thread: