Garmin GPS device not recognized

From the content at 780 map and software updates it appears as though the RV 780, which I'm not familiar with, can be updated using a Wi‑Fi^® network.  Could the device possibly be set to use that method as opposed to a cable connection?

I edited the first post. Yes, it is possible, I am updating it right now over Wi-Fi.

But it is annoying that I cannot see it at all in my computers.

You perhaps missed my point.  By having the RV780 set to update by Wi-Fi, does that prevent the update via cable.

I turned off Wi-Fi and there is no change.

Those are called ferrite beads and they are used to reduce “noise” from the cabling.  Well shielded cables generally won’t have them.  The bead won’t do any harm on the devices that worked well without so might consider making the protected cable your go to cable for all devices.  If you need to get a new cable I highly recommend the Amazon Basic cables that have the gold plated connectors.  

I have those good cables. The issue is that the older devices work fine with them but the RV780 doesn't.

It's not actually a ferrite bead, it is a choke, a cylindrical part. Looks like this one:

Perhaps I studied electrical engineering too many years ago.  The definition from Wiki says “

ferrite bead – also called a ferrite block, ferrite core, ferrite ring, EMI filter, or ferrite choke– is a type of choke that suppresses high-frequency electronic noise in electronic circuits.”