YOTA modem does not work with RB751

good afternoon I have a question … been testing 3G and 4G modem with mikrotik RB751, but we have a brand of modem YOTA, here in Managua, we see that in reviewing the versions 6.0 and 6.4 have been updated including some modems YOTA, but with the latest models that are distributed have not achieved their operation … these are the models …

http://yota.com.ni/es/devices/modems/?sec=jingle
http://yota.com.ni/es/devices/modems/?sec=one

I will appreciate any suggestions or possible solution to use Modem Yota in Mikrotik RB751 as it does not recognize the USB

You notice the version 6.15 is out? From your post is like you still on 6.4 version.

I want to say that using any of the above versions, depending on the model of the modem, I thought that each maintains its modifications improved version …

:::: forgive my English