Sorry everyone, been a very busy few days and only got a chance today to play with the last two settings again to ensure both were required, which they are.
FWIW my car is a 2020 GTS with LED's
Usual warning - make sure your battery is charged/on a tender, make sure you take note of your settings before and after changing and proceed at your own risk
So in essence, on my vehicle to enable high beam assist the following settings were changed:
Instrument Cluster:
Warning Lamps - Indicator lamps coding - high beam assistant: on
Board computer display configuration key 1 - BC configuration byte 13 - high beam assistant: on
Board computer display configuration key 2 - BC configuration byte 13 - high beam assistant: on
Board computer display configuration key 3 - BC configuration byte 13 - high beam assistant: on
Board computer display configuration key 4 - BC configuration byte 13 - high beam assistant: on
Board computer display configuration factory setting - BC configuration byte 13 - high beam assistant: on
Board computer menu configuration 2 - Board computer menu configuration 2 byte 0 - high beam assistant: actuated
Front Camera:
Kodierwert/Kodierwert - P150_Ansteuerung Ladedrucksteller Bank 2-AFS_coding_Light_Assist: high_beam_assist
Front-end Electronics:
Extended codings/Extended codings - FLA codings - High beam assistant (FLA) present: yes
After this, in the MFD go to the vehicle menu, press the scroll button to enter settings, go to settings, light and visibility and then exterior lights and you should have an option to enable full beam assist. Enable this and then try pushing your indicator stalk forward (while in darkness). If all working you should get a second green headlight indicator with an A in it.
Enjoy