WelshGas
Retired after 42 yrs and enjoying Life.
Super Poster
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As far as I am aware there is no 3rd party software added. Just a change in the vehicle software so that it knows a towbar is available so that when the electric of the trailer are plugged in rear parking sensors and vehicle rear fog light are disabled as well as an adjustment in braking etc to accommodate the trailer. This is not affected by any Service software updates unless related to towbar.If you want functions like trailer stability, switch off parking sensors and possibly remapping on engine & gearbox for towing then you’ll need a dedicated wiring kit from third party suppliers not the bypass relay of old.
Do note that the towbar software added isn’t VW and therefore may be deleted during a service software update so may have to be reinstalled by your towbar fitter. I would assume if the vehicle has the VW prep it will include the required software and would be updated during a service if needed.