When im trying to upgrade iphone4 os to 7 it was showing unknown error.error[9].can anyone help me on this??

when I tried to upgrade my iphone4 to 7 version it was showing error "iphone cannt be restored.unknown error [9]".can anyone help me on this?

http://support.apple.com/kb/ts3694
Error 9
This error occurs when the device unexpectedly loses its USB connection with iTunes. This can occur if you manually disconnect the device during the restore process. You can resolve this issue by using USB troubleshooting, using a different Dock Connector or Lightning Connector to USB cable, trying another USB port, restoring on another computer, or by eliminating conflicts from third-party security software.

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