I have a UMI X2. I found this link very helpfule to load the USB Driver.
forum.xda-developers.com/showthread.php?t=1830108
I download mt6589_rooting_pkg.zip file, extracted to c:folder, ran the RUN.BAT command, every thing went fine without a glitch. I verified the root by downloading ROOT CHECKER from the Market.
I still having a problem flashing my UMI X2, I get an error in recovery mode, not sure why or what.
