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It is quite simple - you can only have one tune (software) on your Engine Control Unit. When you install the MPPSK - you get a BMW MPPSK tune/software. As soon as you flash something else - the MPPSK software is completely gone. The only way to get it back is by a tool that allows you to flash back the original software / MPPSK.
Very simple. "Either, or", not "and".
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"Large increases in cost with questionable increases in performance can be tolerated only in cars and women."
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