As far as know, you have to download firmware upgrades for CPUs and smart modules from the support site. They are not included in Machine Edition or any SIMs.
If you're just looking for the FW version of a card, some are available in ME some not. While online with the processor in ME, click "Show Status" from the menu, then click the details button.
This will show all available data for everything in the rack.
If you are actually trying to upgrade FW thru ME, no, not possible.