Limitations of installing FortiGate-6000 firmware from the BIOS after a reboot
Installing or upgrading FortiGate-6000 firmware from the BIOS installs firmware on and resets the configuration of the management board only. The FPCs will continue to operate with their current configuration and firmware build. The FortiGate-6000 system does not synchronize firmware upgrades performed from the BIOS.
See Installing FortiGate-6000 firmware from the BIOS after a reboot for detailed procedures for upgrading FortiGate-6000 firmware from the BIOS.