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System status Changing the FortiGate firmware
FortiGate-4000 Installation and Configuration Guide 109
11 Enter the firmware image filename and press Enter.
The TFTP server uploads the firmware image file to the FortiGate unit and messages
similar to the following are displayed:
• FortiGate unit running v2.x BIOS
Do You Want To Save The Image? [Y/n]
Type Y.
• FortiGate unit running v3.x BIOS
Save as Default firmware/Run image without saving:[D/R]
Save as Default firmware/Backup firmware/Run image without
saving:[D/B/R]
Type D.
The FortiGate unit installs the new firmware image and restarts. The installation might
take a few minutes to complete.
Restoring the previous configuration
Change the internal interface addresses if required. You can do this from the CLI
using the command:
set system interface
After changing the interface addresses, you can access the FortiGate unit from the
web-based manager and restore the configuration.
• To restore the FortiGate unit configuration, see “Restoring system settings” on
page 116.
• To restore NIDS user defined signatures, see “Adding user-defined signatures” on
page 274.
• To restore web content filtering lists, see “Restoring the Banned Word list” on
page 290 and “Uploading a URL block list” on page 293
• To restore email filtering lists, see “Uploading the email banned word list” on
page 303 and “Uploading an email block list” on page 305.
If you are reverting to a previous firmware version (for example, reverting from
FortiOS v2.50 to FortiOS v2.36) you might not be able to restore your previous
configuration from the backup up configuration file.
Update the virus and attack definitions to the most recent version, see “Manually
initiating antivirus and attack definitions updates” on page 125.
Testing a new firmware image before installing it
You can test a new firmware image by installing the firmware image from a system
reboot and saving it to system memory. After completing this procedure the FortiGate
unit operates using the new firmware image with the current configuration. This new
firmware image is not permanently installed. The next time the FortiGate unit restarts,
it operates with the originally installed firmware image using the current configuration.
If the new firmware image operates successfully, you can install it permanently using
the procedure “Upgrading to a new firmware version” on page 103.