Download Firmware iOS 9.2.1 fixes the Error 53

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iPhone 6 Plus : http://appldnld.apple.com/…/iPhone7,1_9.2.1_13D20_Restore.i…

iPhone 6 : http://appldnld.apple.com/…/iPhone7,2_9.2.1_13D20_Restore.i…

iPhone 6s : http://appldnld.apple.com/…/iPhone8,1_9.2.1_13D20_Restore.i…

iPhone 6s Plus : http://appldnld.apple.com/…/iPhone8,2_9.2.1_13D20_Restore.i…

iPad Air 2 (WiFi) : http://appldnld.apple.com/…/iPad5,3_9.2.1_13D20_Restore.ipsw

iPad Air 2 (Cellular) : http://appldnld.apple.com/…/iPad5,4_9.2.1_13D20_Restore.ipsw

iPad Pro (WiFi) : http://appldnld.apple.com/…/iPad6,7_9.2.1_13D20_Restore.ipsw

iPad Pro (Cellular) : http://appldnld.apple.com/…/iPad6,8_9.2.1_13D20_Restore.ipsw

iPad mini 3 (WiFi) : http://appldnld.apple.com/…/iPad4,7_9.2.1_13D20_Restore.ipsw

iPad mini 3 (Cellular) : http://appldnld.apple.com/…/iPad4,8_9.2.1_13D20_Restore.ipsw

iPad mini 3 (China) : http://appldnld.apple.com/…/iPad4,9_9.2.1_13D20_Restore.ipsw

iPad mini 4 (WiFi) : http://appldnld.apple.com/…/iPad5,1_9.2.1_13D20_Restore.ipsw

iPad mini 4 (Cellular) : http://appldnld.apple.com/…/iPad5,2_9.2.1_13D20_Restore.ipsw