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You can't. C and CM series and most all modems are not updateable by users. Only the ISP can update the modem FW:
https://kb.netgear.com/000036375/What-s-the-latest-firmware-version-of-my-NETGEAR-cable-modem-or-mod...
NGs CAX series is the only one that has user FW updates for the router portion of the modem. The modem portion still comes from the ISP.
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