[Solved]:Why update is not coming in my J7?

[#1]

There are many J5 and J7 phones are used nearby me.All of them got new system update to mashmellow 6.1.1
But there is no update comming in my mobile.
It is still lollipop 5.1.1.
Why this is so?

[#2]

Updets

[#3]

New version updets