The only way they will get wiped is if the specifc module is recoded (updated with new software). There are different modules, CAS, FRM, KOMBI etc, so different things could get wiped, if the dealer flahses. E.G, during the emissions recall, my CAS got flashed, so I had to recode somethings.
'09 X5 35D - Work horse
'17 X1 MSport - Wife
'17 340i MSport (ordered) - Soon to be daily