How to Upgrade FortiGate Firmware with CLI

Steps on how to upgrade FortiGate Firmware with CLI

Firmware upgrade from 6.9 to 6.2.2

Download FGT_60E-v6-build1010-FORTINET.out from https://support.fortinet.com/ and store in C:\TFTP-Root (TFTP Server Root)

Login to FortiGate via SSH

#To verify the TFTP Server is online 
exec ping 192.168.1.126

Upload and install the latest firmware

execute restore image tftp FGT_60E-v6-build1010-FORTINET.out 192.168.1.126

This operation will replace the current firmware version!
Do you want to continue? (y/n)y

It will take sometime to complete and reboot automatically once the firmware upgrade process is completed successfully

Verify the firmware version is on 6.2.2 now

FG60E # get system status | grep Version:
Version: FortiGate-60E v6.2.2,build1010,191008 (GA)