Replacing the head unit is a hassle, but if you need a larger screen it's your only option. If you really just want Carplay, there are many options for Multimedia Interface (MMI) boxes that plug in to your existing head unit and don't require any coding. Unique AD, Bimmertech, and Unichip are some of the more popular options mentioned on these forums, but you can also order direct from China via AliExpress.
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