Quote from: admin on September 26, 2022, 06:57:02 AMAs the designs for the ProTrack main board changed (caused by parts going obsolete) the firmware would change with them. Functionally, all of the ProTracks were the same. The KJ3 units had some differences that were requested by the Navy (such as the yellow banana test jack on the back) that did not relate to how they were used by the techs.