Hi Andreas Zolliker,
Can you refresh the web page – LoRa Network Server and see if it will display with more options on this page – i.e: ‘channel plan’ option ?
If so, could you make sure to set it to ‘EU868′ instead of ‘US915′.
If not, try to reboot the unit and check it again.
Also, what firmware version on your mDot ? Issue the command: ati
Otherwise, create a support portal case at http://www.multitech.com
Thanks,
BT