Upgrade 3.0.1 ArduCopter Config, Ch6 Opt no longer works

The Possibility via Channel 6 with a knob to adjust Parameters does no longer work as it should.
Turning the knob the Parameter switches between the lower Limit and the upper Limit.
(No proportioal, analog function)
e.g. Lower Limit =1, Upper Limit=4. Turning the knob ACW at the end the value Change to 1, turning CW at the end the value Change to 4.
Therefore it is not possible to adjust the Parameters during the flight or it takes a lot of time to Change for every flight the Limits.
My solution, downgrade to Firmware 2.9.1b

Sorry, it was my fault. I forgot to calibrate TX Chanel 6.
So no downgrade needed.