Upgrade or Install Samsung Galaxy Tab4 SM-T237P to Android 5.1.1 Lollipop. The firmware available for downloading https://samsung-firmware.org/model/SM-T237P/. You can download your Samsung Galaxy Tab4 SM-T237P firmware at the page, available for some countries. How to Root for Samsung Galaxy Tab4 SM-T237P is the separated post, this post only for upgrading to Android Lollipop.