Installing HBA in A3 8P1 2009

White_A3

Croatia
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hello, I need help with retrofitting HBA, my bordnetz in car (8P0 907 279 N) do not support HBA so i need new one.
I followed steps that guy on forum (henkkeumus) posted and noticed that He have bordnetz 8P0 907 063 G so my question is which bordnetz I can buy and how to be sure that it supports HBA? Is it plug and play or I need to rewire it? My car is redesign with a lot of equipment already installed so with new bordnetz I believe list will be even bigger. Thanks