My Netgear Nighthawk C7800 if not up to date on firmware

As an end user, you cannot update the firmware on a combination modem/router device.  You have to work with your ISP to have them update the firmware.  Who is your ISP?  Some have a better record than others for updating the firmware on the combination devices.

Here is a good reference if you do not already have it bookmarked:  https://kb.netgear.com/000036375/What-s-the-latest-firmware-version-of-my-NETGEAR-cable-modem-or-modem-router 

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Kokoman wrote:

My Nighthawk App Won't Work Because It Says My Firmware Is Out Of Date

 

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That message probably has nothing to do with the modem/router not working.

Kitsap is right in saying that you can't update the firmware. The trouble is that last year Netgear released a broken iOS app that threw up that meaningless message.

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

Note the Netgear response:

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

You just have to ignore it.

I'd look for other ways of fixing your "won't work" issue. What problem do you have beyond that message?

While many questions about routers are generic and could be answered anywhere, some things need specialist knowledge.

You might get more help, and find earlier questions and answers specific to your device, in the appropriate section for your hardware. That's probably here:

Cable Modems & Routers