After its insolvency in Oct. 2019, Bonaverde disappeared from the scene and left thousands of Berlin users alone with the airfilter reset problem.
The problem has been solved in 2020.
The combined effort of a few resourceful and competent Berlin(ers) who had come together in a facebook group hasfinally led to the development of an app that allows you to create RFID tags to control the Berlin yourself.
The raw material required is commercially available writeable tags of the type "Mifare Ultralight EV1".
The cards are available at a reasonable price, for example, here:
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