Below is a List for the Latest Signed apple firmware for discontinued Iphone models[Signed]
iPhoneOS 3.1.3 for iPhone 2G
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iOS 4.2.1 for iPhone 3G
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iOS 6.1.6 for iPhone 3GS
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iOS 7.1.2 for iPhone 4
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iOS 9.3.6 for iPhone 4S
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iOS 10.3.4 for iPhone 5
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iOS 12.5.7 for iPhone 5S
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iOS 10.3.3 for iPhone 5C
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iOS 12.5.7 for iPhone 6
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iOS 12.5.7 for iPhone 6+
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iPhoneOS 3.1.3 for iPhone 2G
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iOS 4.2.1 for iPhone 3G
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iOS 6.1.6 for iPhone 3GS
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iOS 7.1.2 for iPhone 4
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iOS 9.3.6 for iPhone 4S
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iOS 10.3.4 for iPhone 5
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iOS 12.5.7 for iPhone 5S
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iOS 10.3.3 for iPhone 5C
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iOS 12.5.7 for iPhone 6
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iOS 12.5.7 for iPhone 6+
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