My mesh crashed so I had to do a lot of repairs and re-adds, however, now that everything seems to be in good order, I have this one device that won't go away.
I don't even know what it is, the only possible device is already excluded. How do I make it go away?
Everything else works normally, but the Discover button doesn't seem to do anything. This device can only be one dimmer and I already excluded it during my previous troubleshooting...
It has neighbors listed. The SDK will refuse to remove it with a bogus error saying it is not in the failed list anymore.
If you had properly excluded the device that was attached to that exact node, it would have been deleted as part of the exclude. You possibly had this node from a failed pairing of that device and when you excluded it, it would only take the good node out.
So you excluded and re-included the device represented by the ghost, and it's functioning normally.
You should have better results if you kill power to that device and re-try the Refresh/Remove. If it has an air gap, pull it, or kill a breaker. Then do the Refresh/Remove...
I power-cycled all the neighbors, then turned the hub off for several minutes but I still can't remove the device. I have a feeling I'll need that USB stick
However, I haven't had a ghost in forever (like years) and once you have one you learn a lot about how they are created and you get really good at not making more.
Like @danabw I have not had a ghost in forever. Z-Wave on the C-8 has been great for me. The external antenna and the 800 series Z-Wave make all the difference in the world. 99% of my devices join directly to the C-8 hub.