How to update modem firmware

Firmware is the software programmed into your modem that makes it run. Firmware is updated periodically to add new features and keep modems performing their best. Updates are done automatically through the CenturyLink network, so as a rule you never have to think about it. However, if your modem isn't working properly, you can check to make sure the firmware is fully up to date by logging into the modem settings. 

Before you start, keep these tips in mind:

  • We recommend connecting your device directly to your modem with an Ethernet cable, if possible, to get the most stable internet connection. If this isn't an option, you can use a wireless (WiFi) connection.

  • Updating firmware will NOT reset your custom modem settings, so you do not need to back them up first.

NOTE:  Depending on your modem, your settings interface may appear slightly different from the images below.

 5.  Select "Upgrade Firmware" in the left sidebar.

Upgrade firmware step 5

6.  Check the "Upgrade Status" area.

  • If it says Upgrade Firmware, proceed to step 7 to continue the update. 

  •  If it says Firmware is up to date or N/A, you don't need to update. You're all done! You can log out and close the modem settings page.
Upgrade firmware step 6

 7.  To update the firmware, first you'll download the file to your computer. Select "Download" on the Upgrade Firmware screen.

Upgrade firmware step 7

 8.  Follow your browser's prompts to save the file using "Save as."

Upgrade firmware step 8

 9.  Select "Desktop" (or choose another folder if you prefer), then click "Save." The downloaded firmware file is now saved on your computer.

Upgrade firmware step 9a
Upgrade firmware step 9b

10.  Next, you'll install the firmware file you saved in the previous step by browsing to it. Select "Browse" on the Upgrade Firmware screen.

Upgrade firmware step 10

11.  Find the folder on your computer where you saved the file in step 9. Select the firmware file, then click "Open." 

Upgrade firmware step 11a
Upgrade firmware step 11b

  12.  Select "Upgrade Firmware" to start the update.

Upgrade firmware step 12

13.  The screen will show you the progress of the upgrade installation. This step will take about 2 minutes.

Upgrade firmware step 13

14.  Next, you'll see a screen telling you that the modem is rebooting. This step will take about 3 minutes. As the modem reboots, you will briefly lose your internet connection, including WiFi.

Upgrade firmware step 14

15.  Once the upgrade is complete, you will be taken back to the main Modem GUI Login screen. Wait 2-5 minutes for the DSL and internet lights on the modem to turn green before trying to browse to a webpage to test that your connection is good.


If the internet light doesn't turn green, check our modem lights guide for troubleshooting help.


If you need further assistance, contact our technical support team. We're here to help.

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