Having finally stumbled into a factory reset, I find that it didn’t solve my real problem. I can’t get Google Home to recognize the Nova. I saw a thread on this from earlier in the year (involving a Muso). For the record:
The Nova is connected to my home network (via Ethernet)) and the Internet.
I have about 10 other ChromeCast/Google Home enabled devices including a Muso 2.
Edit - on attempt no. 15 it worked.