Unlock transmission lock electronically

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2014 BMW X6, 2013 BMW X6, 2012 BMW X6, 2011 BMW X6, and 2010 BMW X6. However, it is still accessible from the selected car via links, so may be relevant.

Switch the ignition on.
Apply the brake pedal and hold it down during the entire procedure.
Press START-STOP button.
As soon as the starter can be heard to operate (this may take several seconds on diesel engines or at low temperatures).
Press and hold down the release button (1)

Fig 1: Identifying Gear Selector Switch
Courtesy of BMW OF NORTH AMERICA, INC.

The specified time must necessarily be complied with!
Push selector lever (2) forward up to point of resistance and hold for 2 seconds.
Release the selector lever and quickly move it forward by another level again.

Fig 2: Identifying Gear Position N On Instrument Panel
Courtesy of BMW OF NORTH AMERICA, INC.

Gear position N is shown in the instrument panel.
The parking lock is now electronically unlocked.
Release the brake pedal after the parking lock has been successfully unlocked.
Leave the ignition switched on in order to subsequently move the vehicle.
The transmission automatically shifts into P when the ignition is turned off.

Fig 3: Removing Torque Converter Using Special Tool (24 1 440)
Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: When the Start-Stop button is pressed again, the parking lock will be reactivated without message.
If the gearbox cannot be released, turn the ignition off and on again and repeat the previous steps.
Allow the starter to cool down for approx. 10 minutes after unsuccessful attempts.