ZyXEL Communications ZyWall ATP series - How to Restore Configuration File in Device HA Mode

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How to restore configuration file in Device HA mode?
For some maintenance and troubleshooting purpose, user may need to restore
configuration file in device HA mode. Assuming HA had been setting ready and works
perfect for a while, below steps are to guide the user on how to restore configuration
file in device HA mode.
Figure
Note: All network IP addresses and subnet masks are used as examples in this article.
Please replace them with your actual network IP addresses. This example was tested using
the ATP500 (Firmware Version: ZLD 4.35.P2).