There are typically two mains ways a person can root the Android operating system. One of them is by installing a custom recovery image and then flashing something like SuperSU to help become the root user. The other is by using a one-click rooting tool that doesn’t require you to pre-install a custom recovery image at all. One of the one-click rooting tools that is very popular is the CF-Auto-Root tool. Predominantly used for Samsung mobile devices, the CF-Auto-Root tool is available for the Samsung Galaxy A8 SM-A800S smartphone and means that you can begin installing any of the root application that exist out there as soon as it is installed and enabled using the guide after the break.
- You need to have the Samsung Galaxy A8 smartphone that has the SM-A800S model number to use this guide. The CF-Auto-Root files only work for one model number each unless otherwise advised by a professional. Flashing the wrong file often results in the bricking of the device and requires you to flash the stock ROM to get it working again.
- You need to have a computer that is running on Windows because the CF-Auto-Root tool is an Odin flashable file and the Odin flashing tool only runs on Windows operating systems.
BEFORE WE BEGIN
- Note that Chainfire had the MMB29K.A800SKSU1BPG2 firmware build number running on his Samsung Galaxy A8 SM-A800S smartphone when he developed the CF-Auto-Root file that is found in this guide. That information is only to be used as an indicator and does not mean you need to be running the same firmware as him.
- You need to have the USB Debugging Mode turned on  if it is not already and the Developer Options menu must be unlocked  before you can do that on the smartphone.
- The Samsung USB Drivers  should be installed on the Windows computer before getting started with the guide so that the smartphone can connect to the computer and then get detected by the Odin flashing application that is running on the computer.
HOW TO ROOT SAMSUNG GALAXY A8 SM-A800S RUNNING ON ANDROID 6.0.1 MARSHMALLOW WITH CF-AUTO-ROOT
- Download the CF-Auto-Root  tool for the Samsung Galaxy A8 SM-A800S smartphone running Android 6.0.1 Marshmallow.
- Open up the Downloads folder and extract the rooting file to the Downloads folder and then you can see the flashing tool executable file and the flashable rooting file both available from the same Downloads folder for you to use.
- Run the Odin app from the Downloads folder so your flashing tool opens up on the computer.
- Boot the Samsung Galaxy A8 SM-A800S smartphone into the Download Mode  and then connect it to the computer with the USB cable.
- Check the ID: COM port from the Odin user interface is lighting up with a blue or yellow color which is available to let you know that the Samsung Galaxy A8 smartphone is being detected correctly and that the Samsung USB Drivers are working.
- Click on the AP button and then navigate through to the Downloads folder where you extracted the rooting file at the beginning of the guide and select the MD5 rooting file to upload to the Odin app.
- Click on the Start button from Odin and the rooting of the Samsung Galaxy A8 SM-A800S smartphone begins.
In conclusion, that is how to root Samsung Galaxy A8 SM-A800S smartphones running Android 6.0.1 Marshmallow software updates with the CF-Auto-Root tool by Chainfire. Since this is the systemless root version of the CF-Auto-Root tool that allows you to unroot now by taking a hard reset, the rooting can take a few minutes longer.