Thank you davidfor.
I will try that now.
Though I was wondering what is this reimaging the internal SD card? I googled it but the results aren't very knowledgeable....
And there is something I forgot to mention. When I plug the KT with usb to my laptop, the laptop does not recognize the internal or the external storage. The cable is fine because it works perfectly fine with my Nokia Lumia. And the external sd card also works if I put it in card reader...
