After you download the firmware, you need to use shift (option on mac) restore or update to point itunes to the downloaded file!
iOS 4.2.1 for iPad:
iPad
iOS 4.2.1 for iPhone:
iPhone 4
iPhone 3GS
iPhone 3G
iOS 4.2.1 for iPod touch:
iPod touch 4th Gen
iPod touch 3rd Gen
iPod touch 2nd Gen
iOS 4.2 for Apple TV:
Apple TV
iOS 4.2.1 for iPad:
iPad
iOS 4.2.1 for iPhone:
iPhone 4
iPhone 3GS
iPhone 3G
iOS 4.2.1 for iPod touch:
iPod touch 4th Gen
iPod touch 3rd Gen
iPod touch 2nd Gen
iOS 4.2 for Apple TV:
Apple TV
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