Download a local copy of your current system configuration ( .cfg file). Navigate to Dashboard > Status > System Information > Configuration > Backup .

Always take a backup of your current configuration ( System > Settings > Backup ).

This is a very common error that usually prevents the device from booting.

: The official FortiOS release notes are a non-negotiable read before any upgrade. They contain crucial information on new features, resolved issues, known bugs, and hardware/software compatibility limitations. This is your best tool for anticipating potential problems.

Upgrading firewall firmware carries inherent risks. Complete these steps before performing any modifications:

FortiGate GUI versions from , v7.2.0 to v7.2.8 , v7.4.0 to v7.4.3 have a known issue: when you select the "Follow Upgrade Path" option for multi-hop upgrades, the GUI directly upgrades to the target version instead of following the recommended intermediate steps .

This method installs firmware from the bootloader menu and resets the FortiGate to factory default settings. Use it to upgrade to a new version, revert to an older version, or reinstall the current firmware.

The cluster resynchronizes automatically once both units are on the same version. 5. Post-Installation Verification

Increase the check-status-timeout to 3600 seconds and retry the upgrade.

Check that all VPN tunnels, firewall rules, and interfaces are up. Monitor system logs for errors.

Upgrading via the Graphical User Interface is the simplest method for most administrators.

HA cluster members may be registered to different FortiCloud accounts or have mismatched license statuses.

View the available versions under the or All Available tabs.

Every firmware release comes with Release Notes that detail resolved issues, known issues, behavioral changes, and special upgrade considerations. Read them thoroughly before committing to an upgrade.

The FortiGate will upload the file, install the image, and automatically reboot. This process typically takes 3 to 7 minutes. Method 2: Installing via the CLI (Advanced / TFTP)

: The GUI-based upgrade process includes a mandatory prompt to backup the configuration before the installation begins. Installation Methods