Iphone restore, unknown error -1

when I trying to restore my iphone4, after all the process, it shows that "iphone cannot be restored, an unknown error has occured (-1)". and my iphone keeps showing the itunes and usb screen, and cannot be started. anyone knows how to solve this -1 unknown error?

Are you running modified software on your phone? This error usually comes up if you are trying to restore a jailbroken device.

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