HI! I have the same problem that some people also have. I have a naza m v2 with a data link on it. And the BTU module only turn the red light. I've already updated all the firmwares and tried everything. Any suggestion?  

Please check whether you've connect the BTU part correctly, you can provide a picture to indicate your connection. If the problem still persist, please contact local dealer for help.

I have same problemm.. please help me.

Please help me.. i have same problem.

Do you have a PMU V2 to connect the datalink? I've connected the datalinki air tx direct to the naza m v2. I'm waiting for the PMU V2 arrive, I hope that with that works!