Some Lanner Devices (1515A/B) have been shipped with incorrect LTE mode causing LTE interfaces failing to be discovered by the Versa software. Below, you can find a way to identify if your LTE module is in the incorrect mode (MBIM instead of QMI) and ways to fix it.
This procedure applies to all certified devices running Sierra Wireless EM/MC 7455 and EM/MC7511.
By entering the command usb-devices in the shell prompt, you can see the output similar to below. If you notice Sub value of 0e for qmi_wwan, in any of the last 5 lines, it means that the LTE mode is incorrectly configured to MBIM.
Follow the steps below to change the mode to QMI.
For Sierra Wireless EM/MC7455
[admin@versa-flexvnf: ~] $ sudo su
[root@versa-flexvnf: admin]# rmmod qmi_wwan option cdc-mbim qcserial
[root@versa-flexvnf: admin]# modprobe qmi_wwan
[root@versa-flexvnf: admin]# rm /dev/ttyUSB2
[root@versa-flexvnf: admin]# modprobe option
[root@versa-flexvnf: admin]# echo "0x1199 0x9071" > /sys/bus/usb-serial/drivers/option1/new_id
[root@versa-flexvnf: admin]# screen /dev/ttyUSB2
ate1
OK
at!entercnd="A710"
OK
at!usbcomp=1,1,50D
OK
at+cfun=1,1
OK
[root@versa-flexvnf: admin]#reboot <<<< Reboot the system
For Sierra Wireless EM/MC7511
[admin@versa-flexvnf: ~] $ sudo su
[root@versa-flexvnf: admin]# rmmod qmi_wwan option cdc-mbim qcserial
[root@versa-flexvnf: admin]# modprobe qmi_wwan
[root@versa-flexvnf: admin]# rm /dev/ttyUSB2
[root@versa-flexvnf: admin]# modprobe option
[root@versa-flexvnf: admin]# echo "0x1199 0x9091" > /sys/bus/usb-serial/drivers/option1/new_id
[root@versa-flexvnf: admin]# screen /dev/ttyUSB2
ate1
OK
at!entercnd="A710"
OK
at!usbcomp=1,3,10D
OK
at+cfun=1,1
OK
[root@versa-flexvnf: admin]#reboot <<<< Reboot the system
If above dont work with ttyUSB2, try ttyUSB1.
Note: If there is no response on any of the ttyUSB interfaces, power off the device by unplugging the power cable, wait for 1min and power it back on.