Apple has released iOS 4.2.1 firmware for iPhone 4, 3GS, 3G, iPod Touch 4G, 3G, 2G, iPad. Apple TV 2G also get upgrade to iOS 4.2.1.
You may grab iOS 4.2.1 build 8C148 for iPhone, iPod Touch and iPad whereas iOS 4.2.1 build 8C150 is available for Apple TV.
Download iOS 4.2.1 for iPhone 3G
Download iOS 4.2.1 for iPhone 3GS
Download iOS 4.2.1 for iPhone 4
Download iOS 4.2.1 for iPod Touch 2G
Download iOS 4.2.1 for iPodTouch 3G
Download iOS 4.2.1 for iPod Touch 4G
Download iOS 4.2.1 for iPad
Download iOS 4.2.1 for AppleTV2,1
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