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Spectrum refusing to firmware update S33

  • August 27, 2025
  • 1 reply
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My modem is going slower than the speeds I paid for (90mbps down and 20 up instead of 1000 down and 40 up). 

From an AI search it probably needs a firmware update and is not being configured to make use of all the lanes available (my oversimplified version). 

Spectrum support seems to not know that they are responsible for updating the firmware. I’ve talked to 3-4 people via support and some said it’s not up to them and others said it would be done automatically. 

Is there anything else I can do on my end? I’m not a normal user and need the speeds for my small business.  

Best answer by SURFboard Moderator

To help isolate the issue, please connect the S33 modem directly to a computer using an Ethernet cable. This will allow you to check whether the modem is delivering the expected speed when operating as a standalone device.

If still issue persists then we recommend checking the cable signal levels within the modem. If the signal levels are out of the acceptable range, they can lead to the kind of slow issues you're experiencing.

When the signal levels are within the recommended range, your modem can maintain a stable, high-quality connection to the internet

Please refer to the link below for instructions on how to check your cable signal levels:

https://arris.my.salesforce-sites.com/consumers/articles/knowledge/S33-Cable-Signal-Levels

If you find that the signal levels are not within the recommended range, we suggest contacting your Internet Service Provider (ISP) to have them reviewed and adjusted as needed.

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1 reply

Forum|alt.badge.img+42

To help isolate the issue, please connect the S33 modem directly to a computer using an Ethernet cable. This will allow you to check whether the modem is delivering the expected speed when operating as a standalone device.

If still issue persists then we recommend checking the cable signal levels within the modem. If the signal levels are out of the acceptable range, they can lead to the kind of slow issues you're experiencing.

When the signal levels are within the recommended range, your modem can maintain a stable, high-quality connection to the internet

Please refer to the link below for instructions on how to check your cable signal levels:

https://arris.my.salesforce-sites.com/consumers/articles/knowledge/S33-Cable-Signal-Levels

If you find that the signal levels are not within the recommended range, we suggest contacting your Internet Service Provider (ISP) to have them reviewed and adjusted as needed.