51 46 013 Removing and Installing/Replacing Rear Window Roller Blind
WARNING: This page is about a different car, the 2005 BMW 760i. However, it is still accessible from the selected car via links, so may be relevant.
Operation is described in:
Removing and installing/replacing trim for oddments tray (back shelf). See 51 46 000 REMOVING AND INSTALLING/REPLACING TRIM FOR REAR PARCEL SHELF