Determine the upgrade path and upgrade your standalone,
HA, and Panorama-managed firewalls to PAN-OS 9.0.
How you upgrade to PAN-OS 9.0 depends on whether you
have standalone firewalls or firewalls in a high availability (HA)
configuration and, for either scenario, whether you use Panorama
to manage your firewalls. Review the PAN-OS 9.0 Release Notes and
then follow the procedure specific to your deployment: