FortiGate
FortiGate Next Generation Firewall utilizes purpose-built security processors and threat intelligence security services from FortiGuard labs to deliver top-rated protection and high performance, including encrypted traffic.
gmarcuccetti
Staff
Staff
Article Id 200582
Description

This article describes that it can happen to have the error 'Image upgrade failed' while upgrading the FortiGate from GUI.

 

fortigate-upgrade-03.png

Solution

Try one of the subsequent options:

1) Clear the cache of the browser and cookies.

 

2) Use another browser.

 

3) Use incognito mode.

 

4) Verify if FortiGuard is connected so the firmware can be downloaded.

 

If it is failing, either fix the FortiGuard connectivity or try to download the image from support.fortinet.com:

 

Support -> Firmware download -> Download.