Thanks, it work on ttyUSB1 and my 4G connection is up. If anybody else try to use a DWN-222, here are the steps I did on my raspi 3 echo Installation USB_Modeswitch sudo apt-get install libgusb-dev echo Download newest Version mkdir /root/usb_modeswitch cd /root/usb_modeswitch wget http://www.draisb...

Hi all I encountern the same issue I recompile version 2.5.1 and the switch works . But no /dev/USB* appears. With the use of sudo modprobe option;sudo sh -c "echo 2001 7e35 > /sys/bus/usb-serial/drivers/option1/new_id" I obtain 5 /dev/ttyUSB0 to /dev/ttyUSB4, but I am not able to use them...