Thought that the software flash also tells the traction/stability/etc. control systems that you have something heavy behind you (when you plug into the 7pin connector, that is). Helps when the trailer tries to wag the X5, etc.

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Kirk
Las Vegas
2016 X5 40e Mineral White/Black Dakota Leather, ZLL, ZCW, ZDA, ZDB, ZPP, multi contour seats, rear side window shades, HK stereo
2011 E90M3, 6-speed manual