Cadence stopped

[ewan_gronk]

When I first got the drivo 2 trainer I used it without the external sensor which gave a good cadence indication. I then started to use the external sensor and it had been working well. But today I used a different bike on the trainer without the external sensor and can not get any cadence to work through any app.
The power reads fine as well as speed. But no cadence. Its like the trainer is still looking for the external without using the original algorithm.
How can I reset this.

[fmoerl]

same here. how it is possible to switch back to cadence reading without the external sensor.