Yilai Ceiling Light Aiyue 480, no more white color

Since last week sudenly the light turned into ambar color(candle color, warm) and despite i tried via app, google home i can not change it to white cold color anymore.
I also reset the lamp, reinstall app and lamp again without sucess on xhanging color to white.
What can I do?

Contact the after-sales department to change the lamp