Did you update to iOS 6.1 on your iPhone 4S and notice some 3G issues? Well Apple is here to the rescue with the iOS 6.1.1 update. This update has a build number of 10B145.
You should however stay away from this update if you want a Jailbreak, as I am sure the evasi0n Jailbreak does not support it.
You can find the direct download link here: http://appldnld.apple.com/iOS6.1/091-0723.20130211.Fcr43/iPhone4,1_6.1.1_10B145_Restore.ipsw
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- iOS6 1 1ReleasedforiPhone4StoFix3GIssues|LEiMobile
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