I think you have to use the button on the keyfob to pop the boot while in the car, although i've never really had the need to do it while I've been in the car
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M235i Auto: Alpine White / Black Dakota Leather, Brushed Aluminium / High-gloss Black Interior, Driver Comfort / Professional Media / Sun Protection Packages, Harman Kardon Hi-Fi, Enhanced Bluetooth, Lumbar & Heated Seats, Adaptive M Sport Suspension