modem wont work

Based on your product model SBG8300, could you please confirm your subscribed internet speed plan and the name of your internet service provider?

I do not know the speed. Spectrum.

We recommend checking your current subscribed internet speed to help determine whether the issue is related to device compatibility.

Please refer to the link below, where you can find the approved speed tiers supported under Spectrum.

https://www.spectrum.net/support/internet/compliant-modems-spectrum-network