Hi there I was reading the forum and ran in to your post today I have seen this problem with a couple of clones ds708 where it does not conect with many vehicles specially nissans and it turned out to be the the obd2 connector the adapter the is mostly use 16 pin try using the chrysler adapter instead if it connects you know you have a bad obd2 connector the red one I know a person that uses the chrysler adapter for every car with no connection issues hope this helps you, or it could be software try ver 4.30 good luck.