ZyWall 110 Stopped Working and Can't Log In after firmware upgrade

My Zywall 110 has been fine for a couple of years. Yesterday, for the first time ever, it required me to change the password and then installed a software update. At that point it stopped working as a firewall and I was unable to log in with either the new or the old password. Effectively, it is bricked. Either someone comes up with a fix or I am going to have to send it back to the factory for repair??

All Replies

  • Zyxel_Emily
    Zyxel_Emily Posts: 741  Zyxel Employee

    Hi @jschatzman,

    Connect console and see if you can enter debug mode.

    If you can enter debug mode, follow the FAQ to backup running configuration and upgrade ZyWALL 110 to the latest official firmware 4.35(AAAA.2).

    Here is the FAQ for your reference.

    How to backup running configuration if forgot password?

    If there is no reaction on console or you cannot access the debug mode, you have to send the device to repair center.

  • O.k. that worked, after I figured out how to get my serial/usb converter to come online in less than 3 seconds.

    Now I would like to reattach the firewall to my network for diagnostic purposes. How can I change its gateway address to something other than so it won't conflict with my replacement firewall (e.g., change it to

  • Zyxel_Emily
    Zyxel_Emily Posts: 741  Zyxel Employee

    Hi @jschatzman,

    You can access the device via SSH or console and enter the following commands to change the interface IP.

    Router# configure terminal

    Router(config)# interface lan1

    Router(config-if-lan1)# ip address

    Router(config-if-lan1)# exit

    Router(config)# ip dhcp pool LAN1_POOL

    Router(config-ip-dhcp-pool)# network

    Router(config-ip-dhcp-pool)# starting-address pool-size 200

    Router(config-ip-dhcp-pool)# default-router

    Router(config-ip-dhcp-pool)# exit

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