Thanks again.

The device in question is 1390T. Its on its last legs so I am trying to see how things work with Garmin devices. It has lane assist, junction view features but other than the original maps it came with, I have never seen the junction view. Lane Assist feature works though. TBH, I don't even remember if its a full screen junction view or split screen like Drive Smart devices.

Plus, the original JCV file is pretty small, abt 45mb from 2011, name is something 1xxxxxxx.jcv but again I have never seen jcv files starting with 1xxxxx floating around the web. All other jcv files I see around the web are at least 500mb. So I am not too sure if I am using right files.

I tried searching if there is any nomeclature system for jcv files but none that I could find.