Dku-5 Not Recognise

Is the message "USB Device not recognized" or "DKU-5 not recognized"? or you simply do not get any response when you connect your phone?

If the message is "USB Device not recognized", then I feel your cable or the USB port is faulty. Try the cable on another system to confirm which is faulty.

If the message is "DKU-5 not recognized", then I have no suggestions because I've never seen such error before.

If the just don't get a response when you connect you phone, then try this:
  -  If you have PC suite installed, under the connection manager, make sure you enable cable connection.
  - Make sure you have PL-2303 driver installed. You can google  a download link for it.

I have not really used the DKU-5 cable but this should get you up and running hopefully

Cheers!