Yeelight RGB Bulbs dont work / Connection Timed Out

I tried everything, changed DNS Server to, factory resetted the bulbs which resulted in the connection timed out error. It didnt work all week then for like 8hours yesterday and now it doesnt work again. My ID is 6184978727 , I hope you can help me with a firmware downgrade or smth like that. FYI, I live in Germany.