Hi Eric,
I think there's a misinterpretation here. If folks are telling you to change your OS number they are saying "Change to an OS with a different number" not "Change the number in the OS you are currently using."
Calibrations are laid out so the variables and tables are in specific locations. An XDF is like a road map, telling Tunerpro what can be found at each location. If you use an XDF with a different OS then Tunerpro will not have the correct road map. You might think you're editing a spark table and really you're changing something completely different.
In order to "change your OS number" you need to program a calibration from a different car, one with the OS# you need, into your vehicle.
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