6

You need to execute the 3 command one by one. Not type them in one line.

dmesg
logread
ls /dev/

Any way, can you pls try type the following command and check if this works to make the device as a modem. Try unplug and plug your modem one more time if it does not take effect immediately.

echo 9aff 2fd4 >/sys/bus/usb-serial/drivers/option1/new_id