My phone is Samsung galaxy On Nxt. One new update has come on my phone which is of 199mb. Should I download it? Does it contains any benefits for my phone?...

My Samsung galaxy On Nxt charging speed has been slow & the main finger print sensor is also not working properly. It's being only 4 months I bought this phone. And I have never drop my phone.

Why there always Adds come's in between while we are using any Apps. But not only Apps, while we are on the Home screen, suddenly an Adds pops. This problem started after I updated my phone (Samsung galaxy On Nxt). That update was of around 40 MB. Pl...