The FortiAuthenticator firmware can be upgraded from System > Administration > Firmware, the CLI via FTP/TFTP, or through the System Information widget on the dashboard (see System information widget).
For instructions on upgrading the device’s firmware, see Upgrading the firmware.
The upgrade history of the device is shown under the Upgrade History heading in the Firmware Upgrade or Downgrade pane. It displays the version that was upgraded to, the time and date that the upgrade took place, and the user that performed the upgrade. This information can be useful when receiving support to identify incorrect upgrade paths that can cause stability issues.
Always review all sections in the FortiAuthenticator Release Notes prior to upgrading your device.