I have a new BT smart hub 2 with a couple of connected discs. When I view the connected devices on my smartphone some are described as "unknown devices". I do in fact know what they are and would like to rename them. I can do for the ones directly connected to the router (on my PC via the admin login) but those connected to the discs are not identified (the discs are but not what is connected to them). I can see them via the app on my smartphone but again cannot rename them from my app. Do you know how I can rename the unknown devices?