Have you got the right drivers installed? have you run the ftdi program M-Prog? that should tell you what the existing kkl cable you have is set up as. Connect > read and parse > should fill the boxes then click the edit button and you can then save as an *.ept file post it up here. It may just need setting up correctly as a ross-tech type cable. After switching back and forth a lot over the last week or two here is my quickfire nefmoto KKL cable guide.

You have to make it from a dumb KKL cable into a ross-tech hex cable using mprog and it has to be the 232R type cable a vagtacho 245R type one never worked for me(chip inside). Once this is done the cable should be a ross-tech hex usb interface > You Then install the RossTech VCDS aadvanced VCP usb drivers > then using device manager > right click the cable > update drivers and let me select a driver > change to the vcds + vcp driver > yes yes whatever windows jfdi > unplug and Replug the cable, > right click > properties and set advanced to use vcp > unplug and replug > serial port should be recognised>if drivers use VCDS again > new serial port  appears > then set the comport between 1+4 > nefmoto > refresh cable> choose RossTech > slow init > flashing > full read from ECU.

Bobs your uncle and here be dragons.

I had the same issue with the kkl cable.  I found the cable must have the FTDI FT232RL chip in it to work.