As mentioned before, there is a glitch in the control module () firmware, which will allow saving changes in both coding and adaptation but they won't have an effect. This effects most T6 models, though most customers will never notice. Some settings are taking, others are not. Then, months later you tweak a totally unrelated setting and voila everything you tweaked before also comes alive. I've spent the last 2 years on my own T6 again and again to figure this out. At the present time, I got both the audible confirmation as well as the auto-lock/unlock working, as these are the two settings mostly relevant here.