Sorry, I don't know much about the update. They just told me that there is one available, and that they'll upload it whilst diagnosing my problem.
I'll ask more about it when I pick the car up.
Having played about with the stereo the past week, I noticed that you can bring up a screen showing software versions for various systems in the car (I can't remember what systems). I'll publish these when I get it back, so that others can compare their versions, and see if there are any variations.