There is no way for an end-user to update cable modem firmware. Firmware updates for cable modems are approved and provisioned by the cable provider. In most cases your provider will automatically download the latest approved code to your device. If you are unsure whether you have the latest code, you can turn your cable modem off for 10 seconds, and then turn it on again. As it reboots, it will check that it is running the latest code approved by your service provider, and if not, will download the latest version.
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