[Flirc (Streacom) not working on Debian 9 Stretch]

Hy,

my brand new streacom flirc (ST-FLIRC-SE) device is not working currently (on Debian 9 Stretch).

If I use flirc_util as root and as normal user, I always get "device disconnected, can't run command".

 

It happens with both, the debian packages and the Linux binaries.

also the device doesn't show up in lsusb:
 

$ lsusb
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 005: ID 8087:0a2b Intel Corp. 
Bus 001 Device 003: ID 051d:0002 American Power Conversion Uninterruptible Power Supply
Bus 001 Device 002: ID 046d:c318 Logitech, Inc. Illuminated Keyboard
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

But If I open the case, the Blue LED is lighting, therefore I hope, I have connected it properly:
I connected it to the MB this way:

GND <=>GND,

+5V <=> +5V,

DX- <=> DA-,

DX+ <=> DA+

 

and the 10-Pin USB Header on the motherboard is designed as following:

Pin 1,2 +5V

Pin 3 USB DX-

Pin 4 USB DY-

Pin 5 USB DX+

Pin 6 USB DY+

Pin 7,8 GND

Pin 9 NC

Pin 10 NA

 

I use the GA-Z170N Motherboard: (http://download.gigabyte.eu/FileList/Manual/mb_manual_ga-z170n(h170n)-wifi_e.pdf)

And a Streacom Alpha FC8 case.

What can I do now?

Thanks