The solutions is block the rt2800usb

echo ‘blacklist rt2800usb’ | sudo tee -a /etc/modprobe.d/blacklist.conf

restart, and try this

echo ‘install rt2870sta modprobe –ignore-install rt2870sta ; /bin/echo “0df6 0040” > /sys/bus/usb/drivers/rt2870/new_id’ | sudo tee /etc/modprobe.d/rt2870sta.conf sudo modprobe rt2870sta dmesg | egrep ‘rt28|usb|Phy’ iwconfig sudo iwlist scan

(the first Line allocate the Chipset-ID to the driver rt2870sta)

If the solution works, activiate it automatically by a new udev-Rule

sudo gedit /etc/udev/rules.d/10-wlan.rules

Insert the following code and save the file

UDEV-Rule for Sitecom WL-344 ID 0df6:0040

SUBSYSTEM==“usb”, SYSFS{idVendor}==“0df6”, SYSFS{idProduct}==“0040”, RUN+="/sbin/modprobe rt2870sta"

Activate it (or restart)

sudo service udev reload

Credits: flash63 Source: http://ubuntuforums.org/showthread.php?t=1514196