The iPhone 'iPhone' could not be restored. An unknown error occurred (27)

I have iPhone 5S (Model: A1530).

After trying update to new iOS 7.1 I get an error. Now, I try many ipsw and other things on any Mac, BUT everytime I get an error:

"The iPhone 'iPhone' could not be restored. An unknown error occurred (27) "

Now I don't have worked iPhone 😟((

Please, HELP!!!