@ncabral
Good news:
---Manta is functional again, and allegedly on Version 8
---Power cycling the Hub while connected to my laptop did allow the Hub Manager to recognize scenes (does the Hub need to be powered off when you connect the USB cords, before you power it on?)
Bad news:
---The Hub Manager repeatedly told me the update was failing. It wasn't until I just went ahead and checked that I saw it was up and running. So something is weird there.
---The Manta still does not respond to control from the Hub Manager (it won't even engage/disengage). I did not test 3rd party MIDI control.
---I no longer have a copy of Version 6 to revert to, which was functional for me with regard to the previous point.
So what does this seem like---a problem with my particular Manta or a firmware issue?
By the way, if you want to keep this conversation off-line, we can do that. However, since it concerns the newest firmware I thought other people might be interested.