How can i restore my iphone after a failed update

i tried to update my iphone and it gave an unknown error message with code (1015) which rendered the phone useless unless i restore. then i tried restoring it but gave the same error message after its almost done. please help me on how to restore my iphone even if its without the update.

See: http://support.apple.com/kb/TS3694#error1015
That error usually means that either:
You are trying to downgrade the phone to an earlier version
You don't have the latest version of iTunes
Your phone has been hacked or jailbroken in the past

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