GL-iNet x750 cdc-wdm is not found /dev/cdc-wdm0

I am building and updating our own firmware for the x750 using gl-inet/openwrt repo. I see that after I update the x750 device using the 192.168.1.1 update mode that /dev/cdc-wdm0 device does not appear.

lsmod shows all the right drivers loaded, I tried rmmod the driver and modprobe them back in but I still do not see /dev/cdc-wdm0 device.

# dmesg | grep cdc
[ 14.403545] usbcore: registered new interface driver cdc_wdm

# lsmod | grep cdc
cdc_wdm 8309 1 qmi_wwan
usbcore 136828 6 qmi_wwan,usbnet,cdc_wdm,usb_storage,ehci_platform,ehci_hcd

# lsmod | grep usb
mii 5622 1 usbnet
nls_base 5184 6 vfat,fat,nls_utf8,nls_iso8859_1,nls_cp437,usbcore
scsi_mod 96681 2 usb_storage,sd_mod
usb_common 2752 1 usbcore
usb_storage 40043 0
usbcore 136828 6 qmi_wwan,usbnet,cdc_wdm,usb_storage,ehci_platform,ehci_hcd
usbnet 17973 1 qmi_wwan

# ls /dev
bus mtd3ro network_throughput
console mtd4 null
cpu_dma_latency mtd4ro port
full mtd5 ptmx

Any thoughts?

Please refer to this link to modify the driver.