If you get a “router not found” or “Internet not connected” error while installing your NETGEAR router using the Nighthawk app, you might be using mobile (cellular) data to connect to your router. Turn off mobile data, connect to your router using WiFi, and try installing your router again.
See the following external links for instructions about how to turn off mobile data on your smartphone:
iOS: https://support.apple.com/guide/iphone/view-or-change-cellular-settings-iph3dd5f213/ios
Android: https://support.google.com/android/answer/9458407?hl=en
For more information: