Firmware update: Samsung Galaxy J1 SM-J120FN Android 5.1.1 Lollipop. The firmware available for downloading https://samsung-firmware.org/model/SM-J120FN/. You can download your Samsung Galaxy J1 SM-J120FN firmware at the page, available for some countries. How to Root for Samsung Galaxy J1 SM-J120FN is the separated post, this post only for upgrading to Android 5.1.1 Lollipop.