Hi kitercarlos: please see my pm about this issue. It sounds like you have the same problem as I had. Replacement of the mechatronics unit finally got the gearbox working properly. I was fortunate to have a good dealer whose team was determined to get to the bottom of the problem.
My thread on the problem was this:
http://x3.xbimmers.com/forums/showth...hlight=colojim which you have already seen. I shall complete the thread with a final update (hopefully it will be the end of the story).