I also called the Sennheiser Support. Another solution they told me is to mark the sets.
I have now labeled mine with Set A and Set B.
After one “Remote Update” there is the no more necessary.
I have summarized my findings in a video. It speak german, but it is english subtitled.
https://www.youtube.com/watch?v=mf18EF7TeH0
Link to article:
https://motionside.de/sennheiser-avx-remote-update
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