Following the MacBook Air SMC firmware update released on June 9 to fix battery draining problems in the mid-2013 MacBook Air, Apple today released an EFI update for this system and the Early 2014 MacBook Air models, which fixes problems with waking from sleep and booting, as well as a memory and display management issue.

The update specifically addresses these following problems:

1. Improves the reliability of waking from sleep and booting when some USB and Thunderbolt devices are attached.
2. Fixes a memory management issue that could result in random reboots.
3. Addresses a problem when the system’s built-in display will not sleep when using Boot Camp and an external monitor.

The update should be available through Apple’s Software Update service (accessed in the Apple menu) for relevant Mac systems, but can also be downloaded from Apple’s support downloads page and run manually. The update will only install on relevant Mac systems.

As always, be sure you have your Mac fully backed up before applying this or any other software or firmware update. In addition, be sure to follow the on-screen instructions fully, especially since this update is a firmware patch, and incorrect application or interruption of firmware updates may render hardware useless.