USG 20W upgrade old firmware

Liam_McCallum Posts: 1
edited April 14 in Security

I have a Zyxel USG 20W with firmware 3.30(BDR.7) and would like to upgrade it to the latest version. I can only find firmware for the model USG 20W-VPN firmware version 4.35(ABAR.0).

I attempted the upgrade to the device but received and error saying the firmware was incompatible. I am not sure if this is because my device is a different model (note that -VPN is missing in the model number on my device) or because the jump from 3.30 to 4.35 is to big. Or both. I may also be a separate issue altogether.

Any guidance on next best steps would be appreciated.


  • Zyxel_Emily
    Zyxel_Emily Posts: 745  Zyxel Employee

    Hi @Liam_McCallum,

    ZyWALL USG 20W doesn’t support firmware 4.35.

    Here are firmware 4.35 supported models.

    ZyWALL USG Firewall

    ZyWALL 110/ ZyWALL 310/ ZyWALL 1100/ USG20-VPN/ USG20W-VPN/ USG40/ USG40W/ USG60/ USG60W/ USG110/ USG210/ USG310/ USG1100/ USG1900/ USG2200 Series 

    ATP Firewalls


  • mMontana
    mMontana Posts: 130  Ally Member

    Latest USG20W firmware should be BDR.9.

  • Good morning, sorry if I intrude.
    I can't backup my zyxel atp800, I can't find it on my atp800.
    how can I make a full backup of my firewall?
    Thank you


  • Zyxel_Jerry
    Zyxel_Jerry Posts: 422  Zyxel Employee

    Hi @Enrico84

    Welcome to Zyxel Community

    The startup-config.conf file is the configuration file that the Zyxel Device is currently using.

    Go to Maintenance > File Manager > Configuration File to copy the startup-config.conf file.

    You can refer to the user guide to backup the configuration file.

    The information is on page 809 Chapter 40 File Manager Table 352

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