i am unable to restore my iphone 6 from 8.1.2 to 8.3 . Whenever i try to restore it an error 4005 strikes -"could not restore iphone". And phone just displays the apple symbol on screen. i have downloaded latest version of itunes then also same error strikes.And my iphone is not starting up. i also tried to restore it in DFU mode but nothing happened.
please help..
thank you.