have genuine Key Com Ross Tech cable e.t.c. for about 2 years now but it won't 'open controller' on either my B4 or B5.5 passat ,even though it had no problem in the past , engine, abs electrical etc.
Thought laptop glitch has upset how it was communicating so did a port setup test to check - following was displayed in an overpage:

port status o.k.
interface found
type ross-tech key-com v3.01

status questionable
K1 short to ground
K2 short to ground
CAN not supported

the dongle does not have a fuse in, just a board of electronics.

I did try and read a corrado which it wouldn't but later found it had been 'chipped'. Could this have upset something ,if so what is the cure?