Upgrade path planning for PAN-OS 9.1.
When you upgrade from one PAN-OS feature release version to a later feature release, you cannot
skip the installation of any feature release versions in the path to your target
release. In addition, the recommended upgrade path includes installing the latest
maintenance release in each release version before you download the base image for
the next feature release version. To minimize downtime for your users, perform
upgrades during non-business hours.
For manual upgrades, Palo Alto Networks recommends installing and upgrading from
the latest maintenance release for each PAN-OS release along your upgrade path.
Do not install the PAN-OS base image for a feature release unless it is the
target release you want to upgrade to.
Determine
the upgrade path as follows:
