Hi Marcos,
I am having an X98 Air 3G. Maybe Kionix sensor is different on your Air 2?
Did you try above link to driver or the sticky post that Chris made under
http://techtablets.com/forum/topic/teclast-x98-air-series-inverted-screen-gsensor-drivers-fix/
Actually, I used only the driver to install and made registry entries by hand. It turned out I had to tweak those, as presumable in may Air 3G the sensor is mounted differently. But that does not relate to driver not reporting properly installed. Maybe try to remove the driver and give the link in Chris’s above sticky post a try (, while I used the other link).
suisse