Erdbeergulasch

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 hubBut 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