See the following table for the upgrade path for your version. Some versions require an interim upgrade
before you can upgrade to the latest version. Important fixes were added to Version 9.0(3) that make it
possible to upgrade easily to later versions, so we recommend upgrading to 9.0(3) or later.

Note

There are no special requirements for Zero Downtime Upgrades for failover and ASA clustering with
the following exceptions:

•

Upgrading ASA clustering from 9.0(1) to 9.0(2) or later: due to CSCue72961, a Zero Downtime
Upgrade is not supported.