VMG - How to upgrade the firmware – Zyxel Support Campus EMEA
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ZyWALL/USG] Firmware Upgrade Procedure – Zyxel Support Campus USA
Firmware at the Zyxel C3510XZ link is wrong. The chart shows it should be CZX001-5.02.001.6. If an employee sees this would they pass it along to the right folks to get the
Upgrading the firmware of your security gateway/appliance device done properly (USG FLEX/ATP/VPN) – Zyxel Support Campus EMEA
Zyxel VMG Series - How to Update Firmware - YouTube