How to Bypass Error 53 (For ios 9.2.1)

[Boss newbie]

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Download the latest 13D20 IPSW from these

Iphone 6
http://appldnld.apple.com/ios9.2.1/...52919DCAD8/iPhone7,2_9.2.1_13D20_Restore.ipsw

Iphone 6+
http://appldnld.apple.com/ios9.2.1/...52919DCAD8/iPhone7,1_9.2.1_13D20_Restore.ipsw

Iphone 6s
http://appldnld.apple.com/ios9.2.1/...52919DCAD8/iPhone8,1_9.2.1_13D20_Restore.ipsw

Iphone 6s+
http://appldnld.apple.com/ios9.2.1/...52919DCAD8/iPhone8,2_9.2.1_13D20_Restore.ipsw
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