HS230 3-way smart dimmer kit has flickering only at 100% maximum brightness, but not at 99% or below. Workaround to any sort of firmware could be allowing users to set maximum dim level of presets on the physical switch itself similar how you can adjust the 4 presets in the Kasa app. Or, when calibrating dimmness and adjusting slider to minimum light level allow for a maximum brightness level at the top end of the scale.