Offer working solution to Ktag 7.020 error " any car protocols its gray buttons", can't select or choose any cars . ktag v7.020 does communicate between laptop and ktag device and can select cars/trucks/....etc
It does have power.
Possible reason and solution:
connect 12v adapter.
The problem is in the SD CARD that is in the interface. I had the same problem and solved it. Programming the sd card for KTAG and KESS is a very difficult process that cannot be done by everyone. There are two options 1. that somebody who knows, do - can program a new sd card or other option to buy SD CARD.