MattS NZ

Hi team I have a 2005 e46 m3, import from the UK. Recently purchased an Avin Avant 4 stereo to upgrade from what I understand is the factory stereo. I started following the instructions but the connectors at the back were not as expected. Does anyone know what these are (in the photos) and how to connect the new stereo? Really appreciate the help! Matt New Avin stereo: https://avinusa.com/avant-4-multimedia-navigation-system-for-bmw-3-series-e46-m3.html