I have just had a look at the link quoted here, and the Arona isn't even mentioned yet!
However I also own an Ateca which uses the same system, and if I check out the available updates, I am informed that: "Do not rewrite on the original SD card if you are not absolutely sure that you have the MapCare service!" and that "Rewriting the SD card without hiring the MapCare service may cause data loss!"
That was previously the problem, as the MapCare service was not available here in the UK, and I am not sure if that matter has been resolved yet.
Does anyone else have any more information on this subject please?