How to Get Back Access to my I7 NUC based ROCK

The new Netgear V7610 modem on a different power point seemed to be more stable with the laptop and two RPi DACs running RoPieee staying connected to it. But the ROCK NUC would only stay connected for a couple of minutes and then disappear. We could access the ROCK via its admin wed page while it was connected.

The guy decided to change the ROCK to a static IP address. Saved the changes. Now the ROCK doesn’t get an IP address and I can’t access it at all.

The screen reports…
Searching for network address…
If this persists, please check your network connection.

The post Recovering from incorrect static Gateway/DNS Configuration? seems to have been a similar problem. It was solved but no details are given as to how when @eric asked.