This was also mentioned before here, with some technical information about the parameter: Fibaro Dimmer 2 > parameter 38 (firmware version 3.5)
In my case, I have 2x Fibaro Dimmer 2 and I used ‘38,2,125’ to get it to work properly. If i’m correct, it depends on the specific build of your Fibaro Dimmer 2. I have this for i think a year now and works like a charm. I also used the Bypass 2 of Fibaro for the ‘normal’ flickering with dimmers when power consumption is below 25 watt.
