MacBook Air Flash Storage Firmware Update 1.0
Apple has released MacBook Air Flash Storage Firmware Update 1.0 for MacBook Air models released in the middle of 2012. The release addresses a rare problem that could cause a system to fail to recover from a crash. As always with firmware updates, we recommend relying on Software Update or the App Store app to ensure you get the firmware update for your specific model, and being careful not to interrupt the update process. Apple also notes that your MacBook Air will shut down after the update is complete, and that you should wait one whole minute before restarting it. (Free, 1.69 MB)
I have a mid-2012 13-inch MacBook Air, and apparently the firmware update is not required for my unit. Software Update would not load it, and when I downloaded it manually, the installer refused to install it.
Very strange that your model wouldn't be included, Alan, but it's great to have our advice about always relying on the automatic options for firmware updates being useful!
I had the same experience with my 2 Ghz Intel Core i7 (with 8 GB 1600 Hz DDR3) when checking for updates -- but having someone else comment about this and seeing Adam's follow up at least made me feel like I was not doing something wrong. I am sure I learned this much more quickly via TidBits than I would have from calling AppleCare. Perhaps Apple will clarify.
As an aside, I tried to find the history of updates as I would have in the "old days" (e.g., Lion and earlier) when another tab in software update would reveal each one going back a long way, perhaps to the last (maybe only) "clean install."