Enabling TkfE

1) Click Keyboard
2) Type : *#06#
3) You will see imei and at down virtual keyboard

4) click on this vk # 6 times ( no to fast, wait for screen update at every)
5) You will see menu from 1 to 6 elements, press on vk 6 (common)
6) Now choose 3 (usb conf.)

7) And now you may choose 1 to enable tkfe mode

Thats it

After you are done with Tkfe and if you want to use kies set the option to off in step number 7 so that kies can identify your phone

sorry if the images quality is poor