ZyXEL Communications ZyWALL USG FLEX 100 - Ethernet Cable and Heartbeat Port Disconnection; Firmware Downgrade on Device 1

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are selected as monitor interface. Disconnect one of monitor interfaces to make
Device 2 switch to active role.
CONFIGURATION > Device HA > Device HA Pro > Monitor Interface
Ethernet Cable and Heartbeat Port Disconnection
After Device 2 enters active mode, disconnect all Ethernet cables and the
heartbeat port link on Device 1.
Firmware Downgrade on Device 1
On Device 1, enter the command to disable HA Pro.
Router> configure terminal
Router(config)# no device-ha2 activate
Router(config)# write