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"Apple has released an Extensible Firmware Interface update for the late 2013 models of iMac that it just announced on Tuesday. \r\n\r\n&amp;lt;div align=\"center\"&amp;gt;&amp;lt;a href=\"http://support.apple.com/kb/DL1684\"&amp;gt;&amp;lt;img src=\"http://photos.appleinsider.com/imac-130924-1.jpg\" border=\"0\" width=\"660\" height=\"396\" alt=\" \" /&amp;gt;&amp;lt;/a&amp;gt;&amp;lt;/div&amp;gt;\r\n\r\n&amp;lt;a href=\"http://support.apple.com/kb/DL1684\"&amp;gt;The update&amp;lt;/a&amp;gt; brings the EFI for the &amp;lt;a href=\"http://appleinsider.com/articles/13/09/24/apple-updates-imac-with-haswell-cpus-80211ac-wi-fi-nvidia-geforce-700-series-graphics\"&amp;gt;late 2013 iMacs&amp;lt;/a&amp;gt; to version 2.1. It is aimed at addressing an issue sometimes occurring 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, the installation process could cause a black screen to appear.\r\n\r\nAdditionally, the update makes sure that a system will boot by default into OS X after installing Windows 8. \r\n\r\niMac (late 2013) EFI Update 2.1 is available &amp;lt;a href=\"http://support.apple.com/kb/DL1684\"&amp;gt;as a free download&amp;lt;/a&amp;gt; from Apple's support pages. It requires a Mac running OS X Mountain Lion v10.8.4 (12E4022) or later. It is an 8.7MB download."^^<http://www.w3.org/2001/XMLSchema#string>
<http://appleinsider.com/articles/13/09/24/apples-just-released-imacs-receive-day-one-update>