: Skipping versions is a common cause of configuration corruption. You must upgrade in the order defined by Fortinet. Use the official Fortinet Upgrade Path Tool .
Open a terminal/command prompt in the folder containing your firmware and checksums. fortigate latest firmware version download verified
Compare the output hash to the one in the checksums.txt file from Fortinet. If they differ, delete the file immediately and re-download. This is your "verified" moment. : Skipping versions is a common cause of