NO RESPONSE IN APPLE HOMEKIT.Downgrade firmware on Yeelight 1s bulb and led strip

Hello Yeelight.I want to downgrade the firmware of my 1s bulbs and 1s strip.The current firmware (2.1.7__0037) its so buggy.All my lights are always no response at Apple Homekit app except one Yeelight 1s bulb with 2.0.6_0024 firmware.It works all the time with no disconnection problems.I need to fix that because the meaning of smart lights is to do our life easier more fun and playful and surely be better from “dumb” lights we used to have in our homes.I am facing this problem for months now and i cant do this anymore.Thank you and i wait for your response