Download the checksum file to verify the integrity of the downloaded image. 4. Best Practices for Upgrading
One of the biggest mistakes admins make is jumping from an old version (like 6.4.x) directly to the newest version (like 7.2.x). Doing this can corrupt your configuration file because the syntax changes between versions.
Downgrading is considered a disruptive recovery process. Always back up your current configuration before attempting a downgrade. Also, be aware that some newer FortiGate BIOS versions (e.g., 5000100 , 6000100 ) may block downgrades to older FortiOS versions (like 6.0, 6.2, or older 7.x releases) for security reasons.
Once the .out file is on your machine, it’s best practice to verify the . Fortinet provides MD5 or SHA-256 hashes on the download page. If the hash of your downloaded file doesn't match, don't upload it—it’s corrupted or compromised. Pro-Tip: The Local Backup fortigate firmware download
Open a CLI session and run the command: diagnose debug config-error-log read This command reveals if any lines of your configuration failed to convert properly during the upgrade.
You cannot arbitrarily jump from an old version to a new one (e.g., 6.0.x → 7.2.x directly). Fortinet requires following a to avoid configuration corruption.
Locate the specific build number you require. Filter or scroll down to find your exact FortiGate hardware model (e.g., FG_60F , FG_100F ). Download the checksum file to verify the integrity
However, the web method above is far more common for manual downloads.
FortiGate firmware images are compiled specifically for individual hardware architectures. Ensure the filename matches your model precisely: For the FortiGate 60F. FGT_100E-v7.xx.xx: For the FortiGate 100E.
Fortinet’s centralized management appliance allows you to host firmware images locally, map out global upgrade paths, and schedule automated orchestration workflows across thousands of devices simultaneously. Doing this can corrupt your configuration file because
Under “Product,” choose . Then select your exact model (e.g., FG-60F, FG-200F). Do not rely on auto-detect.
Ensure you select the correct file type: .out : Used for standard upgrades on existing deployments.