Why Oem unlocking option is hidden or not shown in developer option in many Samsung devices like s6 edge????

Why NO updates for s6 edge ???At least pls!!! update our s6 edge 'oneui'

Will there be Oreo update for s6edge ???

my s6 edge display glass has been totally scratched can I change the outermost glass or should I change the full display??if I have to change the glass how much the cost to change it? (OR)if I have to change the display how...

I have bought s6 edge 4 months ago but i have a battery draining issue .Its battery drains so fast. I am charging 3 to 4 time a day.HOW TO SOLVE THIS PROBLEM??