About the Release Notes
The release notes provide critical and release-specific information for Version 6.4.0.x, including upgrade warnings and behavior changes. Read this document even if you are familiar with Firepower releases and have previous experience upgrading Firepower deployments.
Upgrading or freshly installing (reimaging) a Firepower deployment can be a complex process. Rather than provide instructions here, the release notes point you to the appropriate resources. For links to upgrade and installation instructions, see: