Maybe someone in the Audio/Electronics section has discussed this. Check:
https://www.2addicts.com/forums/forumdisplay.php?f=520
Good luck!
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2015 BMW 228i in EstorilBlau II Metallic / Terra Dakota Leather - 6-speed manual, M Sport Package, Cold Weather Package, Lighting Package, Premium Package, Harman Kardon premium sound, Anti-theft alarm system, Blue Metallic Matt Accent Moldings, Aluminum Hexagon Interior Strips, Anthracite Headlining