Just got a GL-MT300A, and I’m trying to set it up with my MiFi® 4G LTE Global USB Modem U620L. When I plug the modem into my 300A’s USB port, I get lights on the modem to light up, and it looks like it is getting power and signal, but my 300A never sees the modem. I’ve looked in the Tethering and 3G tabs, but both places say to Plug in Modem or Phone. The modem is generally host-less, and when I use it with my laptop, it shows up as an Ethernet connection.
I just went through this same exercise and made the following notes for myself. As a neophyte myself, consider the recommendations with caution. Nonetheless, these work for me with the GL-AR300M and the Novatel U620L on Verizon:
Modeswitch
The wireless modem needs to be configured for “enterprise mode” which makes the host see it as a modem instead of a mass storage device. It also provides access to AT commands via serial port.
To make this happen, the host (router) needs to have the usb_modeswitch package installed. OpenWRT comes with this by default.
When the router boots, the usbmode daemon looks for USB devices in /etc/usb-mode.json
Modify
/etc/usb-mode.json to include:
“1410:9020”: { “*”: { “msg”: [ ], “config”: 4 } },
After making this change and rebooting the router, test with
root@GL-AR300M:/dev# lsusb Bus 001 Device 003: ID 1410:9022 Novatel Wireless Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Confirm that the Novatel modem returns ID 1410:9022 instead of the default ID 1410:9020.
TTY port
Need to tell the router to add the optional serial driver for the modem:
Edit /etc/rc.local to add
echo ‘1410 9022 ff’ > /sys/bus/usb-serial/drivers/option1/new_id
just prior to exit 0
Just wondering if this issue has been resolved. Jut bought the router, updated firmware to 2.261 but it still does not recognize Verizon U620L. Do I have to do something specific to the U620L to have it recognized? Very frustrating…