iphone 4s permanent locked after updating ios 7.0.4
i have an iphone 4s, which was network unlocked phone, while i updated it on ios 7.0.4, it got permanently locked .
is there any body who can tel me why it happened to me ???
and how can i get it unlock again ????
help me plsssssssssssss
iPhone 4S, iOS 7.0.4, iphone locked after updating