The document provides instructions for updating and downgrading PAN-OS software. It explains that major releases have new features and fixes, minor releases have new features and fixes, and maintenance releases only have fixes. It notes you must upgrade in order of major, minor and maintenance releases and cannot skip versions. The instructions provide a step-by-step process for upgrading from 6.0.1 to 7.1.6 and downgrading from 7.1.6 to 6.0.1.