Firmware update / Stock ROM : Samsung Galaxy S7 SM-G935FD Android 7 Nougat. The firmware available for downloading https://www.sammobile.com/firmwares/database/SM-G935FD/. You can download your Samsung Galaxy S7 SM-G935FD firmware at the page, available for some countries. How to Root for Samsung Galaxy S7 SM-G935FD is the separated post, this post only for upgrading to Android 7 Nougat.