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That is very strange. I just updated two M5's a few days ago. Purchased a USB drive, and did not format it.. just drag and dropped the one file (no other files existed on drive). Sounds like you have had this issue for a while, but have you tried that?
What version are you trying to upgrade from?
What version are you trying to upgrade to?
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2013 BMW INDIVIDUAL ///M5 {Frozen Black/Amaro Brown/Amaro Brown Alcantara/White Contrast Stitching/Piano Black Trim}
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