What are the problems that you are facing?. If you describe them we might be able to help you out. Is your phone getting slower?, or you are facing power issue?. One thing that you must know is that Samsung phones tend to get slow after 2 years of launching. That is how they get their consumers to buy new models. They do not give update after two updates to a certain flagship device. So if you are facing lag problem you just have to deal with it.