Blue Led, blank Screen during Bootloader Unlock topic

Hi there,

I tried to unlock my new Z1C with Sony Bootloader Unlocker from Kingo.
Currently the program is Stuck at the following Screen
img5.fotos-hochladen.net *dash* uploads/17mg2pno8qa.png (sorry I'm new an can't post images now)
It says fetching unlock data

The phones screen is blanc and the LED is lit blue.
In the Devide Manager S1Boot Fastboot is listed as unknown devices.

My question is now, what can I do to get the phone back working? Is it safe to just unplug USB?

Thanks a lot for help!