As said updates are very common, and not always a improvement either.
The w*****s updated the ecu on mine when did the master key, and deleted old ones on my mk1 mondy, he said it does it automatically as soon as connected to system, was driving like bag of poo afterwards, so I kicked up big time and refused the car back, they do seem to be able to access prior databses however once restored it was ace again.
tabetha