[USG FLEX H] Can the device be upgraded directly from V1.10 to the latest V1.39?

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Can the USG FLEX H series be upgraded directly from V1.10 to the latest V1.39?

You can directly upgrade your USG FLEX H series devices from V1.10 to the latest version V1.39.

Below is the firmware update guide for the USG FLEX H series for your reference:

[USG FLEX H]How to update firmware on the USG FLEX H series — Zyxel Community

Your original settings will be preserved after the upgrade. However, we still highly recommend backing up your configuration file before proceeding.

Below are the steps to back up the USG FLEX H configuration file for your reference:

[USG FLEX H] How to download configuration file via Local WEB GUI? — Zyxel Community

Pre-Upgrade Precautions

• Backup Configuration: Always save and back up your current configuration file to your local computer before starting any upgrade process.
• Do Not Power Off: Once the firmware transfer begins, do not turn off or interrupt power to the device. The process can take between 5 to 15 minutes.