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:
Here is NXP chip sold in China.
Last but not least, ensure you have one good quality of Ktag clone. i.e SE135-B1 (73.39euro, red pcb), SE135-E(63.22euro, red pcb).