Whether you are patching a critical security vulnerability, upgrading for new features, or performing a fresh install on a new appliance, knowing how to safely is a fundamental skill for any network administrator.

In the world of network security, the operating system powering your firewall is the first line of defense against cyber threats. For organizations utilizing Fortinet solutions, keeping that operating system—FortiOS—up to date is not merely a matter of gaining new features; it is a critical security imperative.

One of the most confusing aspects of downloading FortiOS is choosing the right branch. Fortinet maintains three types of release branches simultaneously.

: Click HTTPS next to the file to save the .out image to your computer. 3. Critical Pre-Download Steps

: The tool will list every firmware version you must install in sequence to safely reach your goal. 2. Download the Firmware Image