Panorama is being used to upgrade the PAN-OS version on a pair of firewalls in an active/passive high availability (HA) configuration. The Palo Alto Networks best practice upgrade steps have been completed in Panorama (Panorama upgraded, backups made, content updates, and disabling "Preemptive" pushed), and the firewalls are ready for upgrade. What is the next best step to minimize downtime and ensure a smooth transition?
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