iMac(late 2013) EFI Update 2.1

This update is recommended for iMac (late 2013) models.  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.
   

Post Date: Sep 24, 2013

File Size: 8.7 MB
System Requirements

OS X Mountain Lion v10.8.4 (12E4022) or later
Supported Languages
Deutsch, English, Français, 日本語, Deutsch, English, Français, 日本語, Español, Italiano, Nederlands, Deutsch, English, Français, 日本語, Español, Italiano, Nederlands, Dansk, Norsk Bokmål, Polski, Português, Português (Brasil), Pусский, Suomi, Svensk, 简体中文, 繁體中文, 한국어, Deutsch, English, Français, 日本語, Español, Italiano, Nederlands, Dansk, Norsk Bokmål, Polski, Português, Português (Brasil), Pусский, Suomi, Svensk, 简体中文, 繁體中文, 한국어, Bahasa Indonesia, British English, Crna Gora, Eesti, Hrvatski, Latviešu, Lietuvių, Magyar, Melayu (Malaysia), Română, Shqip, Slovenčina, Slovenščina (Slovenija), Tiếng Việt, Türkçe, Íslenska, Čeština, Ελληνικά, Български, Македонија, Українська, עברית, العربية (مصر)‏, ไทย


http://support.apple.com/downloads/DL1684/en_US/iMacEFIUpdate.dmg