The calibration procedure is the BMW procedure for changing glass when the car has a KAFAS camera for the driver aids. The reason is that you have to put the rear view mirror / camera on the new glass and you aren't going to be able to get it positioned and angled the exact same as the previous installation, so the module can run a calibration. If you can place it very accurately or don't care about lane departure or collision avoidance features there is no need to recal.
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