With this article you are purchasing a firmware update for three different firmware version to start from. With CD1 updates the firmware from 1110 to version 5150. And with CD2 you can update the Bluetooth function, with CD3 you can update the firmware version 5150 to 5570.
Save money in which they perform the update by itself, with the CDs you get e.g. software from 1110 to 5150. The update will update e.g. the Bluetooth, Mobile phone / telephone, tuner and CD changer.
The software version you can get in the MMI like that: Push it to CAR / Setup / Settings (top right) / version (with the control knob). In the upper bar you see e.g. "SW: C6-HU 55.7.0 0835," the No. 55.7.0.