Yeelight connection timed out

My modem is ZHXN H267A. My product is Led Bulb (color). I cant connect with this device because of conneciton timed out. Im using 2.4 ghz and i closed 5.0 ghz for this device. I tried, DNS. I tried a lot of things on WLAN SSID but it still didnt work. I need help. What should i do?