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i know this thread is over 10 years old but has anybody successfully upgraded his obc to 18 buttons? i'm aware it's not plug and play and requires some wire splicing job based on what i found here https://www.bimmerforums.com/forum/showthread.php?1062154-Ultimate-DIY-for-18-Button-OBC-Upgrade-from-7-or-11-Button-OBC-Made-Easy-w-Pictures!/page3