C7800, can’t connect to Nighthawk App

[randomPst]

Just bought this cable modem/router combo and am having trouble with the Nighthawk app on iOS. It keeps asking me to update firmware but it’s already running latest version.

[michaelkenward]

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@randomPst wrote:
It keeps asking me to update firmware but it’s already running latest version.

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Ah. That one.  The message is nonsense. You cannot update the firmware on a cable modem/router. That is down to the ISP.

What’s the latest firmware version of my NETGEAR cable modem or modem router? | Answer | NETGEAR Sup...

If your firmware is outdated, you cannot manually upgrade your cable modem’s or modem router’s firmware. You must contact your Internet service provider (ISP) to upgrade your firmware.

There's a  bug of some sort that you can safely ignore:

Nighthawk app same "firmware not updated" when it ... - NETGEAR Communities

You will also find more on this in the section for your hardware.

Cable Modems & Routers

This one , for example:

C7800 - NETGEAR Communities