sm-g900f update problem topic

O Just recently got a sm-g900f and im stuck with kitkat 4.4.2, cant find Lollipop update, not even 4.4.3 or 4 4.4, i got it from orange and its unlocked, is there anything i can do to receive updates? It says im up to date and that there are no updates available. Cant use kies since i dont have a pc atm