Our CarrierBoard has miniPCIE for USB function.
We use Quectel LTE EC25-G,but can’t connect internet by Ubuntu modemmanager and Quectel’s tool (quectel-CM).
We use Quectel LTE EC25-G at ubuntu 18.04 for x86 is work fine.
BSP version:R32.3.1
Use ls /dev/cdc* command,that can found cdc-wdm0.
Use ls /dev/ttyUSB* command,that can found ttyUSB0~ttyUSB3.