Figured it out for myself

I kept telling customer service that when I log into my Router, my Tivo is listed as connected wirelessly even though Tivo couldn't see the router. Tivo's customer service was stumped. I couldn't get Tivo to see the router WIRED or WIRELESS. Every time I tried to connect wirelessly, Tivo would keep telling me to unplug the Ethernet cable (even though it was unplugged!). Not wanting to loose my recordings, and since I knew it was on my network, I looked to see if my PC would talk to Tivo and transfer the recording to my PC with the Tivo Desktop app. It worked! I called customer service AGAIN to tell them my PC would talk to Tivo and pull off my recordings that obviously it was a problem with the Ethernet port. I asked if there was a way to turn off the Ethernet port on the Tivo. Nope, no work around or way to turn off the Ethernet port according to Tivo's Customer Service.

After googling, I discovered if I plugged something into the USB port it automatically shuts off the Ethernet Port. After rebooting with a thumb drive plugged into the USB port and the Ethernet unplugged, I could finish set up wirelessly!!!! I would rather be "wired" with Ethernet, but at least I can get out of that setup loop and use my Tivo until my RMA arrives. Jeeze....after about 4 hours of them having me try this and try that....you would think someone would have had me try that!

I hope this helps someone else. YMMV.

Pretty cool. Thanks for the posts! I haven't seen that problem or solution before.

What model TiVo is it?

It is the base Roamio. Not the OTA only model.

OK - thanks again for posting the info.

N02 Problem :
Cannot connect to wireless router, Tivo roamio pro sees the router, I can select it from the list,
but after a couple more steps,(DHCP) Im in a loop with a N02 error.
The Fix:
Using a cell phone I set up a hot spot and connected the roamio to it. It took, I then let
it setup all the way on the hotspot. It setup fully including its updates.
I then went to Network in the settings and was able to switch to my router (TP link AC2700).