This minor update to the EFI of the MacBook Air in mid-2013 fixes a bug that some users have been reporting for a long time and is that try to install Windows 7 or Windows 8 Using BootCamp, when finishing creating the partition and restarting the computer, it showed a black screen if the external SuperDrive and a USB drive were connected at the same time.
Also as we can see in the change log, also the default boot has been changed so that when you finish installing Windows 8 the computer will restart and directly load OS X without having to leave the Alt key pressed to choose partition and then change it in system preferences.
Although there is no update directly, I have perceived this same problem in my iMac from the end of 2012 since a few days ago I had to create a partition to install Windows 8 and when downloading the drivers to a USB connected to the iMac and then restarting with it Windows DVD on the SuperDrive got a black screen with the following message: "Bootcamp: installer disk could not be found" and that mysteriously when removing the usb with the aforementioned drivers, the installation would work normally again.
I guess this means that it won't take long for them to release another update for the iMac but you never know. Anyway, if we look back on these 2013 MacBook Airs have had a lot of software problems in their output that they have been alleviated as time has passed and that now they really seem to me an excellent option once the problems with the Wi-Fi connection or the screen flickering have been solved.
More information - "MacBook Air WiFi Update 1.0" beta patch to resolve Wi-Fi issues