The channels are distributed digitally, and there are multiple channels per frequency. This makes it impossible to tune in to the them manually. The radio keeps a live updated list of available channels at all times where you can select channel from the iDrive or the steering wheel. If the channels are not listed, then they are out of range.
Notice that the channels can be organized in groups (like files in folders). I don't remember the technical term for the groups now, was it ensembles? Anyway, you can also select between these groups. This is typically necessary if you are close to a border between two countries sending DAB channels in different groups. I recommend using the DAB menu in the iDrive to have a good overview of the channel structure.
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