A company has two Palo Alto Networks firewalls in an active/passive high availability pair. The firewalls are configured with a virtual IP (VIP) for the internal network. Recently, the passive firewall was upgraded to a new PAN-OS version. After the upgrade, the active firewall is still running the old version. The administrator wants to perform a failover to make the upgraded firewall active. However, when the administrator attempts to manually failover, the new passive firewall does not become active. The HA synchronization status shows 'synchronized' but the preemption is disabled. The administrator checks the HA configuration and finds that the peer's version is not compatible. What should the administrator do to successfully failover to the upgraded firewall?