My iPhone 5 is stuck at connect to iTunes logo and when I try to restore it, everything goes fine till around 70% then I got a error in iTunes “iPhone could not be restored unknown error 1”. It has never been jailbroken.

What I tried:
DFU Mode – still error 1
Shift + Restore – still error 1
Another USB cable – error 1
Another Computer – error 1
Changed Battery – again error 1
Please help me to fix error 1 on my iPhone 5 GSM model from AT&T US.