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How to update ZYXEL NAS326: First, you need to download firmware from the official website of your router manufacturer. Next, login into the router, check how to Open Admin Page. Now choose Maintenance and find Update or Firmware Update. Then, press on Choose file and pick downloaded Firmware. At last, click on Upload and wait for a moment.
The manual .bin file upgrade is not affected. The devices on firmware 5.20-5.21 will show an endless "Device HA Pro Firmware Upload is in progress" bar, but the firmware will not transmit to the device, or the device will not go into a reboot. These are the steps to fix the issue without rebooting the device or rebuilding the HA cluster:
How to update ZYXEL DEL1201-T10A: First, you need to download firmware from the official website of your router manufacturer. Next, login into the router, check how to Open Admin Page. Now choose Maintenance and find Update or Firmware Update. Then, press on Choose file and pick downloaded Firmware. At last, click on Upload and wait for a moment.
I also do not have any Zyxel products and have found the same information you have while looking for help online. I don't even have a router. Just a modem that I use to connect online. I think it would be a good idea for you to update your router's firmware, even though it isn't a Zyxel.

How to update ZYXEL NBG6617: First, you need to download firmware from the official website of your router manufacturer. Next, login into the router, check how to Open Admin Page. Now choose Maintenance and find Update or Firmware Update. Then, press on Choose file and pick downloaded Firmware. At last, click on Upload and wait for a moment.

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how to update zyxel firmware