Fortinet FortiGate FortiGate-5001 Administration Manual page 54

Changing the FortiGate firmware
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If you successfully interrupt the startup process, the following message appears:
[G]: Get firmware image from TFTP server.
[F]: Format boot device.
[B]: Boot with backup firmware and set as default.
[Q]: Quit menu and continue to boot with default firmware.
[H]: Display this list of options.
Enter G,F,B,Q,or H:
4 Type B to load the backup firmware image.
The FortiGate unit loads the backup firmware image and restarts. When the FortiGate
unit restarts it is running the backup firmware version with a restored configuration.
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