https://upgrademyaudi.net/tutorials/how-to-update-maps-audi-mmi-3g-3gp/

Getting into engineering menu;

When you are already in Engineering Menu you can now recognise your MMI, so:

  MMI 2G: SW: XX-XX XX.X.X XXXX
  MMI 3G Low/Basic: BNav_XX_XXXXX
  MMI 3G High: HNav_XX_XXXXX
  MMI 3G+: HN+_XX_XXXXX or HN+R
  MMI RMC: RMC_XX_XXXXX