How to update the firmware of ZyWALL USG series devices operating in Device HA (Master-Backup) mode without interrupting the work in the local network?
The update algorithm is as follows:
1. Choose the running partition on the active device.
2. When you upload the firmware on the active device, it will first transfer and install the firmware on the passive device.
3. After the passive device is finished with the reboot process, the active device will perform the firmware update and reboot.
4. It will take around 10 to 20 minutes for the whole process.
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