Hello I' bought recently a lot of TMT250 trackers, and now I am busy configure them. Some of the trackers (now 3 out of 50) can't connect to the configuration tool. It is doing nothing when I connect the TMT250 to the computer. It will not start the tracker, like the other ones. I also started these trackers manually and then I can send and receive SMS. I set the tracker via SMS on default configuration, but still it will not connect to the configuration tool. Does anybody knows what to do ?