Upgrade or Install Samsung Galaxy J1 SM-J120F to Android Lollipop 5.1.1. The firmware available for downloading http://www.sammobile.com/firmwares/database/SM-J120F/. You can download your Samsung Galaxy J1 SM-J120F firmware at the page, available for some countries. How to Root for Samsung Galaxy J1 SM-J120F is the separated post, this post only for upgrading to Android Lollipop.