iTunes error 9

Hello,

Everything started at the attempt of update from 9.3.3 to .4 on an iPhone 6. It failed, restarted itself and wanted iTunes connection. After connecting it wants a complete reimage, but after it writes the firmware and would jump to next step restore of iPhone, it breaks up with Error 9.

I did all of the troubleshooting of the KB(other cable, other usb, other PC, clean windows w/o any anti virus just for a test, even tried with the cable of a co-worker who bought his phone several days ago.

Now it is stuck in the recovery mode and endlessly loops in the restore-error-restore circle.

Any suggestions?