Hello,
I cannot enable developer mode permanently. It works only if I am still in this option. If I get out of menu and enter again developer mode option is deactivated. Is it working so properly otthere is something wrong with my Yeeligt Android application?
Sometimes, App failed to read this value back due to network issue, you can refresh our app and see. The option is permanent on the bulb, you can provide it easily (by power off the bulb and power on).