Apple on Friday released the MacBook Air EFI Firmware Update 2.7 for MacBook Air models released earlier this year. You’ll especially want to install this update if you are using Boot Camp and Windows on your laptop; it fixes a problem where a black screen appears when you have both an external optical drive and a USB thumb drive connected to the iMac while installing Windows 7 or 8. It also allows the MacBook Air to boot into OS X by default if you’ve installed Windows 8.
You can get the update by running Software Update on your MacBook Air, or you can download it from Apple’s support page.
Does this update sound familiar? Apple released a similar EFI Firmware update for the iMacs in September.
As always before installing a firmware update, it’s a good idea to back up your data beforehand.