After you successfully add a ZTP firewall to
the Panorama™ management server, configure the target PAN-OS version
of the ZTP firewall. Panorama checks whether PAN-OS version installed
on the ZTP firewall is greater than or equal to the configured target
PAN-OS version after it successfully connects to Panorama for the
first time. If the PAN-OS version installed on the ZTP firewall
is less than the target PAN-OS version, then the ZTP firewall enters
an upgrade cycle until target PAN-OS version is installed.