Upgrade or Install Samsung Galaxy S4 DUOS GT-I9502 to Android Lollipop 5.0.1. The firmware available for downloading http://www.sammobile.com/firmwares/database/GT-I9502/. You can download your Samsung Galaxy Tab S4 DUOS GT-I9502 firmware at the page, available for some countries. How to Root for Samsung Galaxy Tab S4 DUOS GT-I9502 is the separated post, this post only for upgrading • Read More »