EfiUpdate
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Apple issues day-one EFI update for new iMacs to address Boot Camp issue
No sooner had Apple announced the 2013 iMacs than they also issued a day-one EFI (Extensible Firmware Interface) update for the speedy new all-in-ones. The update is targeted at an issue that sometimes occurs when installing a Boot Camp partition with Windows 7 or Windows 8. The issue appears when an external optical drive (the devices have no internal optical drive) and a USB thumb drive are connected at the same time, causing the screen to go black. The update also ensures that the default boot drive for the system will be OS X after Windows 8 is installed. iMac (late 2013) EFI Update 2.1 can be downloaded from Apple's support pages, and requires that the Mac be running OS X Mountain Lion 10.8.4 or later.
Apple releases EFI firmware updates for 2011 Macs, crushes bugs
If you're anything like us, your inner-geek revels in hearing rare system beeps while holding down obscure key combos that only occur while updating low-level firmware. While much of those theatrics have since disappeared in the modern era, those of you with 2011 iMacs, Mac Minis, MacBook Pros and MacBook Airs can at least relive some of that nostalgia as you update them to their latest respective EFI firmwares. There's four versions (one for each machine, naturally), yet Apple tells us they all address the same underlying problems, including improving "the reliability of booting from the network" in addition to addressing "an issue that can prevent HDCP authentication" after reboots. Finally, there's improvements pertaining to "boot device selection when a USB storage device is hot-plugged." Direct links to the respective support pages are below, or those seeking to avoid guesswork can simply go on ahead and fire up Software Update. Your call.
