Help me please! I have a Beryl AX (GL-MT3000 fw version 4.5.0), I use Quectel RM520N-GL with GL-M2 board. When manually configuring the modem using the QMI protocol, the /dev/cdc-wdm0 device is not visible in the list.
Can you tell what interfaces are in the list?
Sorry to bother you, after rebooting the router, the device appeared in the list 
Is there a significant difference between QMI and QCM?
Are there advanced modem manager Gl.Inet plugins?
Thanks for the feedback!
QCM is from quectel so it is supposed to be more compatible with quectel modem.
QMI is standard protocol.
AT command should be the most advanced modem management tools.