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turn the key so everything is working but the car isn't started. then push and hold the little black button that resets the odo. while holding the button turn the key all the way back to the off. next time you start the car it should switch back to F.
TURN OFF RADIO FIRST BEFORE DISCONNECTING THE NEGATIVE BATTERY CABLE BUT.THATS NO GUARANTEE YOU WILL LOSE RADIO CODE I WOULD TRY TO USE A BACK UP MEMORY SAVER YOU PLUG IN THE CIGARETTE LIGHTER BUT NO GOOD IF CAR GOING TO BE DOWN LONG.TIME BECAUSE THE MEMORY SAVER BATTERY WILL GET WEAK YOURE IN TROUBLE.BMW WARNS IF YOU DISCONNECT BATTERY CABLES YOU WOULD LOSE HEATING COOLING CLIMATE CONTROL.YOU ALSO WILL LOSE FUNCTION TO WINDSHIELD WIPERS AND WASHER , CENTRAL LOCKING AND THEFT SYSTEM CONTROL.
There is a fix for this on the web. You have to remove the control unit and replace a resistor or capacitor. I did mine and it worked like a charm. Takes a coupla hours. the resistor is less than a dollar.