How could I get update history for firmware versions on a FG1500D for the past 18 months?

[DS998]

How would one go about showing the upgrade history going back at least 18 months on a 1500D?

[dingjerry_FTNT]

Hi @DS998 ,

Not sure what your FortiOS version is.

You may check the upgrade history using Revisions:

https://community.fortinet.com/t5/FortiGate/Technical-Tip-Using-the-Revision-option-to-revert-to-a-p...

[AEK]

Try this one:

diag sys flash list

[dingjerry_FTNT]

This command "diag sys flash list" will only show the last two firmware images installed (including the current one).