Modem firmware library

To access the current firmware version specific to your modem, and check for any available updates, follow these steps:

  1. Sign in to your secure modem settings at Note that you can access that URL only when you are connected to the CenturyLink network (i.e. not remotely).
  2. Select Utilities on the main screen, then select Upgrade Firmware in the left sidebar.
  3. The settings interface will indicate if a newer version of firmware is available. If so, you can download and install it from there.

Are you an advanced user? If so, you can download the current firmware for your modem from the table below, then install it through the modem user interface.

tower modem sticker - make and model

You can find the name of the manufacturer and model number printed on the sticker attached to the side, back or bottom of the modem.

Tip: If the firmware link doesn't work, try another browser (Chrome is known to have issues with this kind of link). Or, right-click the link, select "copy link address", then paste the link into a new browser tab.

Modem Firmware download link
Axon C4000BG CGB001-
Axon C4000LG CGL007-
Axon C4000XG CGX008-

Actiontec C1000A


Actiontec C1900A
Actiontec C2000A CAH006-31.30L.95
Actiontec C2300A CAS001-31.165L.11
Actiontec C3000A CAD002-31.165L.4
Actiontec PK5000 QAP002-
Actiontec PK5001A CAP002-10.0.29
Actiontec Q1000
Adtran C424G CAO001-
Calix C844G CCO005-11.1.700.96
Technicolor C1100T
Technicolor C2000T
Technicolor C2100T
Zyxel C1000Z
2-step upgrade package required. Please update firmware through your modem's online settings portal.
Zyxel C1100Z
Zyxel C2100Z
Zyxel C3000Z CZD005-
Zyxel C3510XZ CZX001-
Zyxel C4000BZ CZB001-
Zyxel C4000LZ CZL002-
Zyxel FR1000Z CZF003-
Zyxel PK5000Z QZP004-
Zyxel PK50001Z CZP006-
Zyxel Q1000Z

* Table updated July 10, 2023

What if my modem is bridged?

In rare situations, you may have bridged your modem. If you can't access your modem settings through, try the following: 

1. Press the reset button on the back of your modem using a paper clip or pen tip until the power light turns red. 

2. Wait for the internet light on the front of the modem to turn green (5-7 minutes). Now open up a browser and finish setup. 


3. Check your modem's Utilities menu for the latest firmware version. You will be able to upgrade from there if needed. 


4. If you want to bridge your modem after the firmware upgrade, follow the instructions on the WAN settings page.

What if I don't see my modem listed?

If you are a CenturyLink internet customer and your modem isn't listed in the table above, contact us to ask about upgrading to a newer modem.

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