updating firmware from a web browser. HELP

HELP! I am trying to update my firmware using a web browser. I think that is the problem. My spectrum internet is coming through fine and they said the router/modem is the issue. I am trying to troubleshoot on my own.

The app isn't working because the wifi isn't working well at all. 

I have an ethernet cord so I can access the web browser. I can successfully login to Netgear Genie (routerlogin.net). 

It looks like the current firmware is:  V1.03.04

I am following directions that I found here:

https://kb.netgear.com/23442/How-do-I-update-the-firmware-on-my-NETGEAR-router-with-a-web-browser

I can go to "advanced" tab and then I can't find anywhere to check for updates under "administration"

There is nothing that says "Firmware Update or Router Update."

My exact model number is C6300v2 - modem/router combo

Thank you!