I'm using an LG4c Android v5.0.2. I have enabled Developer Options - it is in the menu where I can tap it to open it. When I tap it, it opens for a split second - long to enough to see that it is on (blue button is on) and but turns off almost instantly so that in effect I cannot access it. How can I get it to stay on? Why does it not stay on?
try it by going on safe mode(hold the power off option and click ok), after that use the developer options and by the same procedure , reboot into normal mode.