Below is a List for the Latest Signed apple firmware for discontinued Apple Tv models
iOS 7.1.2 for Apple TV 2G
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iOS 8.4.6 for Apple TV 3
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iOS 8.4.6 for Apple TV 3 (2013)
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iOS 13.4.8 for Apple TV 4K
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iOS 7.1.2 for Apple TV 2G
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iOS 8.4.6 for Apple TV 3
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iOS 8.4.6 for Apple TV 3 (2013)
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iOS 13.4.8 for Apple TV 4K
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