Upgrade or Install Grand Prime SM-G531M to Android Lollipop 5.1.1. The firmware available for downloading http://www.sammobile.com/firmwares/database/SM-G531M. You can download your Samsung Galaxy Grand Prime SM-G531M firmware at the page, available for some countries. How to Root for Samsung Galaxy Grand Prime SM-G531M is the separated post, this post only for upgrading to Android Lollipop.