I got a new phone and want to turn my old rooted Sprint Note 3 into a media player. I won't be using it for anything except playback of audio (and maybe video). I want it to run as fast and smooth as possible. Please advise on the best way to do this, and: - whether the phone be more efficient by installing a custom ROM or just restoring to factory settings in the normal way - If I restore phone to factory settings in the normal way, will I lose root? - In either case, what changes/settings will I need to adjust for minimal processes running and maximum cpu/ram available? - What is your favorite audio player app for local playback (I will load the phone with mp3s and m4as)?