I don't have an Iron Pro in hand (or I probably could find a solution for you) so I requested my colleagues at the UMI office to investigate this problem.
I'll come back with an answer later.
Sorry but no news yet about this case. It is already out of my control. I suggest you to contact support@91umi.com referring to this thread for further information.
I am almost solve the problem I edited the build.prop. I disabled the gesture. the only thing missing is the "T" key is not working. all the other key are perfect. I think some other trick is necessary to make everything to work properly!!!!!!!!!!!!!!!
I manage to figure out everything on my own.
solved also the other issue it is the double tap awake which broke the bluetooth keyboard.
Here the solution
ro.mtek_double_click_support=0
Bye
Nice job. So the gesture sensing feature conflicts with the bt keyboard. Interesting. Isn't it simpler to just turn off all gesture sensing functions? Or is it ineffective?
I did not find that option in phone settings so I tried to change the build.prop and it worked. Now if someone else has the same issue knows a possible solution which it is not impossible to apply since the device is pre-rooted.
if you want I can write a small how to. bye