I have the registered version of vag-com 409.1 s. It was working ok until i borrowed the cable to my friend as he was having trouble with his cable.......he said your cable dont work either. I got it back and pluged in to my 2001 A4 audi and to my suprise it didnt work! WHY ? it was working 2 weeks ago,fine. Never had a problem,now when i plug into a car this is what i get: interface status = -1 interface not ready ! possible reasons incorrect com port interface not plugged in ignition not turned on k-line stuck update needed for more details use test screen on option screen. Please help! dont know why its gone like this!