EFI Firmware Update for 2011 Macs
If you own a 2011 Mac (iMac, MacBook Air, MacBook Pro or Mac Mini), you most likely have an EFI Firmware Update waiting for you in software update.
[quote]This update improves the reliability of booting from the network, addresses an issue that can prevent HDCP authentication after a reboot, and resolves an issue with boot device selection when a USB storage device is hot-plugged.[/quote]
Software Update Versions/Links: