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Originally Posted by TIM3TRAV3LER
I believe he means firmware update the car.
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Yes, in a nutshell. An integration level is actually a specification of multiple firmware updates to different modules in the car. Sometimes also called i-Level or I-Step or a few other things. BMW tests that the firmware versions of your ECU, head unit, etc. all work together properly, and then calls the collective update an "integration level". You can think of it more like an operating system "build" version. Not everything changes with each release.
Since it involves updating lots of different modules, it's easiest to have a dealer do it for you.
Did you sort out CarPlay on your car, TIM3TRAV3LER?