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Apple is signing old ios 6.3.1 for iphone 4s and ipad2 . Is still possible to downgrade your old iphone 4, 4s and ipad2 to iOS6.3.1. If you pretend to icloud bypass if you are using this ipsw version is much more easy to icloud bypass. Also you can activate de device without sim card.
Put your device in recovery mode:
Download ipsw 6.3.1
go to iTunes shift+restore
downgrade
iPhone 4s iOS 6.1.3 downgrade party still alive Go for it with shift+restore on iTunes But download iOS 6.1.3 ipsw first.

Apple is signing old ios 6.3.1 for iphone 4s and ipad2

How to hactivate or activate your iPhone 4s without a sim card. if you want to jailbreak your device just finish the process with redsn0w. Its a tethered jailbreak so you�ll need to boot tether your device and you�ll have cydia.
after downgrade jailbreak your device using Redsnow: download
Redsnow  is one of the best and all-time-favorite software released by iPhone Dev Team to jailbreak all iDevices including iPhone 3GS, iPhone 4, iPhone 4S, iPad 1, iPad 2, and iPod Touch models. Redsnow can jailbreak any iOS firmware, up to iOS 6.1.3. But it provides tethered jailbreak on some devices running on specific iOS. In this post, we will try to cover everything you need to know about Redsn0w and jailbreaking.
Apple is singing old ios 6.3.1 for iphone 4s and ipad2 , we don�t know if this is temporary only or will be signed for old devices forever.