[steaman]

This is from the owners manual belonging to my X3 F25 2011:

Update software via USB.

Updating may only be done when the car is stationary.

1. Save the file with the updated software in the main folder of a USB stick.
   
2. Connect the USB stick to the USB audio interface in the center armrest. It is not possible to update the software via the USB interface in glove compartment.