Part of the docsis spec is the ISP has to update the firmware for modems.
Netgear does submit the firmware to the isp for upgrades but half the time, the isp's don't push the upgrade because they have to certify it and that takes time and money. Which the isp's hate to do.
Its one of the reasons we don't recommend combo devices because the router firmware is tied into it as well.
At least yours is a stand alone modem device. There's not much you can do if cox isn't pushing the new firmware. You can check which version your on to the isp specific ones available. Sometimes a factory reset and reinstall will trigger the auto download to new firmware.
https://kb.netgear.com/000036375/What-s-the-latest-firmware-version-of-my-NETGEAR-cable-modem-or-mod...
Are you having issues with it that you think you need newer firmware?
