ZyXEL Communications VPN Series Handbook page 638

Note: The firmware update can take up to five minutes. Do not turn off or reset the
ZyWALL/USG while the firmware update is in progress. This example was using USG110
(Firmware Version: ZLD 4.25).
Download the Current Firmware Version from ZyXEL.com
Go to www.zyxel.com/support/download_landing.shtml
current firmware package.
www.zyxel.com
and download the
638/810