Troubleshooting Tip: Warning this firmware failed signature validation

The above warning may show when upgrading FortiGate in GUI. However, the CLI will show it certified after continuing and upgrading it successfully.

get system  status
          Version: FortiGate-60F     

             v7.6.1,build3457,241127 (GA.F)
             First GA patch build date: 240724
             Security Level: Low
             Firmware Signature: certified

             Branch point: 3457
             Release Version Information: GA

This warning is a GUI issue. It will not affect performance or device operations.

Related article:
Troubleshooting Tip: 'Installed firmware is not signed by Fortinet' error