How can I resolve different firmware in HA units?

In Gen6 and Gen6.5, under certain conditions, SonicOS HA service will warn you about differences between the firmware in Primary unit and in Secondary unit, even when both units are running exactly same firmware release. 

If both units are not running exactly the same release, please use the feature to synchronize firmware and from the unit with the most recent release to avoid downgrades.  

However, in rare cases both releases are exactly the same. If the admin tries to sync firmware with the HA feature, the problem will not be resolved. 

Disable diagnostic mode under Firmware & Settings.