Tutorial 1 | Raspberry Pi Kernel update for Sixfab 3G/LTE shield’s usb drivers

Original Raspbian Jessie kernel doesn’t support Quectel EC25/UC20 modules, then we fixed kernel, you can replace your module files with new files.

1. Run sudo rpi-update command and update kernel your Raspberry pi
2. Reboot your machine
3. You can use your modem with /dev/ttyUSB3

Issues :

1. If ttyUSB3 does not appear under folder /dev/ when the 3G ( UC20 ) module is plugged in, and ‘device not accepting device address XXX, error -71‘  appears on the ‘dmesg’ output, please change your USB cable.