Upgrade or Install Samsung Galaxy A3 SM-A300FU to Android Lollipop. The firmware available for downloading http://www.sammobile.com/firmwares/database/SM-A300FU/. You can download your Samsung Galaxy A3 SM-A300FU firmware at the page, available for some countries. How to Root for Samsung Galaxy A3 SM-A300FU is the separated post, this post only for upgrading to Android Lollipop.