Hi,
Here is not update 
Firmware: 1.5.5_0038 > Yeelight JIAOYUE 650
Firmware: 1.5.5_0034 > Yeelight JIAOYUE 450
Firmware: 1.5.5_0180 > Yeelight yeelight led ceiling light
Firmware: 1.5.5_0164 > Yeelight bedside lamp
Firmware: 1.4.2_0044 > Yeelight LED Strip´s
Firmware: 1.4.2_0061 > Yeelight E27 Smart LED Bulb
Im Up to date ?
Is there a newer firmware?