syadnom
Please read this: http://forum.mikrotik.com/t/how-to-send-at-commands-to-ec25-lte-modem-in-ltap-mini/131542/1 about ECM mode and post feedback if this give you success or not.
Of course please upgrade ROS to stable or beta channel.
Stuff what have decision about properly detect device (only as ROS example) I write here: http://forum.mikrotik.com/t/ltap-mini-series-lte-missing/137294/1