FQDN - Firmware Upgrade Steps for devices updating from 4.39-4.55 Firmware Version

Attention: Please read this article completely!
It´s very important to not risk any abnormal behaviour on your device!

October 6th - Zyxel recently found out, that some firmware versions affected by an "FQDN" bug. This bug will cause multiple issues (see below). If you are using FQDN, it´s a must-have to follow this article to smoothly recover your device without any risk.

Affected Devices:

ATP Series

USG Series

USG-Flex Series

Affected Firmware Versions on Running or Standby Partition:

4.39C0

4.39 WK32

4.38 WK26

4.38 WK30

4.55 WK26

4.55 WK30

If you are using one of the above Firmware Versions on one of our affected devices, please make sure to check if you are using FQDN objects.

Check by SSH:

show running-config | match "fqdn"

If you see any FQDN related output like:

address-object "Name" "FQDN"

You are affected, please follow the procedure below to upgrade successfully to one of the following firmware versions:

- Upgrade to 4.60 WK50 or later

- Upgrade to 4.62 or later

Both partitions need to be updated to be fully protected.

If you don´t get any output, it´s fine, you can skip this article and you don´t need the coming modification.

Upgrade Steps:

1. Backup your configuration
   (Go to Maintenance -> File Manager -> Select: "startup-config" and Download it. You can also choose the "Copy" button and copy it.
2. Upgrade new Firmware to selected Partition
3. THE DEVICE WILL STUCK NOW AND NEED A MANUAL REBOOT!
4. Restore your config, if needed.
5. Repeat it with the other partition, if needed.

We are very sorry, that we missed this bug during our quality check and we have adjusted the needed test flow to ensure you get the best quality out of the box.

If you encounter any trouble or have any questions, feel free to be in touch with our Support Team

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