When you get your tunes you will need to go here:
SCT Automotive Performance Products
4th tab on the top is "tech support" click that
when that opens click "device updates and download"
1) select the x3 Ford
2) device update software
on the next page download the "X3 Enhanced Updater Software"
follow on screen directions.
when the tune arrives its best to make a new folder on your desktop named "tunes" save your new tune to that folder. (to create a new folder on your desktop, simply right click any blank area on the desktop and scroll to NEW>folder left click. Then re-name it by right clicking on the “new folder”)Once this is done, connect the X3 to your computer and open the X3LW updater, once opened click "load custom tune file" once this opens you will then browse for your file and overwrite one of the old ones.