Firmware update: Samsung Galaxy A8 SM-A800IZ Android 6.0.1 Marshmallow. The firmware available for downloading https://samsung-firmware.org/model/SM-A800IZ/. You can download your Samsung Galaxy A8 SM-A800IZ firmware at the page, available for some countries. How to Root for Samsung Galaxy A8 SM-A800IZ is the separated post, this post only for upgrading to Android 6.0.1 Marshmallow.