I am using in two month and I have no problem in this phone. Samsung j2 in internal memory 8gb and also 1gb ram and anroid virson 5.1.1 and base band virson j200GDDU1APE6 and j2 is upgradable phone it rear camera is 5MP and front camera is 2 MP.
All application are working in this phone. I am not facing hanging problem in the phone. And samsung j2 best colure in gold. And samsung j2 screen size in 5 inch. GPS abilable in the phone also a hotsport abilable in the phone. 3.5 mm jak. Also a 3.5mm jack in the phone . Also a abilable. Mp3 player. In market a abilable in 3 colure glod black and white And also a expandeble 64 bd j2 bettry backup is very long and also a OTG supportable .
And Go to samsung live update page and select j200G model but there is no update shown there you can check it. but maybe there is problem in your memory card.
Replace memory card with another one or use another memory card to see what happens.if not help, then format your mobile.remember to backup important files to pc or pen drive or to other device first its the hardware that designed that way. you cant light them up.between there is no need to light up those keys.you just have to know where those keys are, simple
