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If you are not under warranty, just put the JB4 in pass through mode (map 0) and go to a 3rd party shop that services BMWs.
If you still want to remove the JB4, just reverse the directions - unplug the JB4 from the various sensors and plug the sensors back in to the stock harness. I never locked the doors and waited for the ECU to go sleep. However, it takes 10 mins to remove all the stuff to enable access to the sensors anyway.
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PTF Map, Pure Turbo Stage 1, GFB DV+, Mfactory LSD, AA FMIC, B12 Pro Kit, M3 FCA, AR DP and
Dynavin N6, Mosconi AS100.4, AS100.4, AS200.2, Micro Precision tweeters & woofers, Esotar2 1200
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