I’ve got it working, had to do the following:

  • Disconnect modem
  • Click ‘Manual Setup’
  • Change Device to ‘/dev/ttyUSB3’
  • Change Service to ‘LTE/UMTS/GPRS’
  • Set APN
  • Click ‘Apply’

Came straight up. Looks to be an issue with using the CDC-WDM port for this connection, which is a shame. Has the Luci admin panel been installed by default on this device? If so how can I access it?