To see the checksum of the OS (operating system) files currently installed on the Firebox:
Select System Status > Checksum.
The Firebox calculates the checksum for the installed OS. It might take a few minutes for the Firebox to complete the checksum calculation. When the calculation is complete, the checksum appears, with the date and time that the checksum calculation was completed.
For more information about the System Status pages, see Monitor your Firebox with Fireware Web UI.