I just bought two Yeelight LED bulbs color. The first works very well (connection to WIFI ok, yeelight app android OK). The second refuses to light: when pressing the switch to turn on, the bulb flashes one time very quickly and remains off. Same thing when I press the switch to turn off. I tried several times the reset (5 times turn on and off for 2 seconds) and on other points of light without effect. Yeelight application on android does not detect the bulb.
What can I do before I request a refund?
Thank you in advance