Marshmallow update for the S4 and the Note 3 will never be released. Samsung has moved on and has given out the latest Android 6.0 Marshmallow update to a lot of Galaxy devices from 2014-2015, including the Galaxy Note 4, Galaxy Note 5, Galaxy S5, and Galaxy S6. But the Galaxy Note 3 and Galaxy S4 are still stuck on Android Lollipop. And always will be, forget it or move on like I did, sorry but that's just the way it is, sammy don't care cus they took your hundreds of pounds and that's gota pay to put the note 7 battery right, think twice b4 buying sammy phones, enjoy kitkat ; -)