Solution
The firmware is automatically upgraded along with the Cisco IOS software release. If you have both supervisors modules that run the same Cisco IOS software release, they have the same firmware version.
In order to display the module status and information, use the show module version command, which displays the version information.
Note: The firmware does not have to match on both the supervisors in order to work properly.
You cannot use the normal software upgrade procedure for Catalyst 6000/6500 series switches that have redundant supervisor modules. Refer to Catalyst 6000/6500 Series Switches with Redundant Supervisor Engines Software Image Upgrade Configuration Example in order to upgrade the Catalyst 6000/6500 series switches in redundant mode.