[rjn21]

Prise out the lamp unit as you have done. To avoid any short circuits and blown fuses, disconnect the lamp form the wires - a small screwdriver will do that. Just press in on the little tab in the black connector.

Once separated, just prise wide the sides off the reflector and it will come off giving you access to the bulb. If using the ECS kit use one of the 9 LED longer bulbs to keep the 5 LEDs for the glovebox, roof lights and door bases.

As you will see its no longer a festoon bulb in the trunk, but a W5W wedge same as all interior (bar mirrors).

If you manage to change the footwell lights please post. I couldn't do those - they seem to be some kind of dual LED (yellow white light) that cant be removed.

BMW also do a kit for the trunk light as an LED - 63 31 2 348 803.