Apple today released EFI firmware update 2.7 for 2013 MacBook Air’s that addresses an issue with installing Windows via Boot Camp. The update is recommend for all those using MacBook Airs that were released after Apple refreshed their hardware over the summer.
This update addresses an issue which may cause a black screen to appear when installing Windows 7 or Windows 8 using Boot Camp Assistant if both an external optical drive and USB thumb drive are connected to the system. This update also ensures that the system will boot by default into OS X after installation of Windows 8.
Source – Cult of Mac
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