I have bought SM-J500 Model. It shows 5.1.1 and whuch is updated it shows! so, how can I update to marshmellow? And another thing, I face network problem in some area in Bangladesh, so U think an update can make things better.Yes, it’s a good phone for it’s price. But this model is already outdated. Try another Samsung Galaxy J5, which was released on March 2016 ( it has more RAM - 2GB ( vs. 1.5 GB in this) , more internal memory - 16 GB ( vs 8 in this) , and bigger battery ( 3100 mAh vs 2600 mAh in this phone) .