How do you replace broken front seat belt on BMW 328i?

To replace a broken front seat belt on a BMW 328i, first, remove the lower trim panel and the bolt securing the seat belt retractor. Disconnect the seat belt from the buckle and retractor, then install the new seat belt by securing the retractor and buckle in their respective positions. Finally, reattach the trim panel, ensuring everything is properly aligned and secured before testing the seat belt for functionality. Always consult a repair manual for specific torque specifications and safety precautions.