Another possible solution is one that I just completed and related on a different thread. I tried one USB adapter (discovered too late that the purchased revision was not supported), then another USB adapter whose revision was supported (purchased a refurbished adapter). Neither worked for me.
So, not wanting to further over-work lenient return policies on USB wifi adapters which could not be readily identified visually by “supported revision or non-revision” I decided on a new Cisco WES610N dual band wireless bridge which comes with 4 gigabit ethernet ports on the back side.
I plugged it into power, pressed the “Wi-Fi Protected Setup” buttons on my router and then on the bridge and within 2 minutes had a working connection. Plugged the WDTV Live Hub into one of the ethernet ports and was instantly up and running on 5g side of the router. Everything is working perfectly (so far) and I updated to the latest 2.07.17 FW via wifi without any issues (other than the apparently standard lengthy completion of the 2/2 step).
I couldn’t be happier as I’ve eliminated any/all of the “is this adapter and/or revision supported by the Hub” questions, plus now have 3 extra ethernet ports in the entertainment alcove, one of which is going to receive the ethernet cable from my Samsung LCD.
The Cisco bridge is not cheap ($130) but there is a single-port version (WET610N) for $100. But it did work for me and I’m pleased with the results so far.