Chapter 10 Install and System Administration for FortiOS 5.0 : Using the web-based manager : Dashboard : System Information widget : Changing the firmware
  
Changing the firmware
 
To avoid losing configuration settings you should always back up your configuration before changing the firmware image.
Also, when updating firmware, you should first refer to Supported Upgrade Paths for FortiOS Firmware to help ensure a successful upgrade.
Administrators whose admin profiles permit maintenance read and write access can change the FortiGate unit’s firmware. Firmware images can be installed from a number of sources including a local hard disk, a local USB disk, or the FortiGuard Network.
To change the firmware, go to System > Dashboard > Status > System Information widget and select the Update link on the Firmware Version row.
Upgrade From
Select the firmware source from the drop down list of available sources.
Firmware Version
This appears only when selecting FortiGuard Network is selected from the Upgrade From drop-down list. Select a firmware version from the drop-down list.
If downgrading the firmware on the FortiGate unit, select the check box beside Allow Firmware Downgrade.
Upgrade File
Browse to the location of the firmware image on your local hard disk.
This field is available for local hard disk and USB only.
Allow Firmware Downgrade
Select to confirm the installation of an older firmware image (downgrade).
This appears only when selecting FortiGuard Network is selected from the Upgrade From drop-down list.
Upgrade Partition
The number of the partition being updated.
This field is available only if your FortiGate unit has more than one firmware partition.
Boot the New Firmware
By default, this is enabled. Select to disable the FortiGate unit’s reboot process when installing a firmware image to a partition.
This option enables you to install a firmware image to a partition without the FortiGate unit rebooting itself and making the firmware image the default firmware that is currently running.
 
You need to register your FortiGate unit with Customer Support to access firmware updates for your model. For more information, go to http://support.fortinet.com or contact Customer Support.