From your output it shows, your device is already QMI/AT mode. But My devices are changed to MBIM mode, but i’m unable to revert back to original state to support AT commands,
instead of GobiNet, please see below mine is MBIM driver,
Port 1: Dev 4, If 0, Class=Communications, Driver=cdc_mbim, 5000M
Port 1: Dev 4, If 1, Class=CDC Data, Driver=cdc_mbim, 5000M
Port 1: Dev 4, If 2, Class=Vendor Specific Class, Driver=GobiSerial, 5000M
Port 1: Dev 4, If 3, Class=Vendor Specific Class, Driver=GobiSerial, 5000M
Port 1: Dev 4, If 4, Class=Vendor Specific Class, Driver=GobiSerial, 5000M
qmicli --device=/dev/cdc-wdm0 --device-open-proxy --dms-swi-get-usb-composition
error: couldn’t get USB composite modes: QMI protocol error (94): ‘NotSupported’