Becoming the root user is appealing because it lets people choose what they want to have installed on the device in question. It allows them to be the ones to decide what system apps are removed, so there is only the minimum amount resources being used which then becomes beneficial to the user like yourselves. The root user can also choose to install any number of the root applications that are in existence today. There are thousands of these root apps that will not run unless you have granted the required root permissions over the operating system first and that is precisely what we are doing when we follow a guide like the one below that teaches you how to root Samsung Galaxy Tab Pro 12.2 SM-T900 tablets with the CF-Auto-Root one-click rooting tool.
The following guide is made to root Samsung Galaxy Tab Pro 12.2 SM-T900 when they are running on the Android 5.1.1 Lollipop software updates by flashing Chainfire’s one-click rooting tool known around the world as CF-Auto-Root.
- You need to have the Samsung Galaxy Tab Pro 12.2 tablet that has the SM-T900 model number to use the version of the CF-Auto-Root that is made available in this guide. Any other model number will get bricked, and you will need to flash the stock ROM from Sam Mobile to get it working again.
- You need to have the Windows operating system booting up on the computer that you plan on using in this guide that is running the flashing tool app. The Odin flashing tool only works on Windows.
BEFORE WE BEGIN
- There are two versions of the Samsung Galaxy Tab Pro 12.2 SM-T900 tablet. The CF-Auto-Root tool available in this guide is developed for the exynos5 version of the SM-T900 model number only. Make sure you have the right model, or it will brick the device, and you will need to flash the stock ROM from the Sam Mobile website to get it working again.
- Chainfire had the LMY47X.T900XXUBPA1 firmware build number running on the Samsung Galaxy Tab Pro 12.2 SM-T900 tablet when he created the version of the CF-Auto-Root tool that is available in this guide. You don’t have to be running on the same firmware version as him. You just need to make sure that you have the right SM-T900 model number and that it is running on Android 5.1.1 Lollipop and the guide should work for you.
- Unlock the Developer Options menu  on the Samsung Galaxy Tab Pro 12.2 SM-T900 tablet so you can then enter it and turn on the USB Debugging Mode . That USB Debugging Mode is what then allows you to have changes made to the Android operating system. Without it, the rooting file cannot get flashed correctly, and the rooting fails.
- Install the Samsung USB Drivers  on the computer before you get started with the guide below. That way when you do connect the Samsung tablet to the computer with the USB cable it can be picked up and connected correctly to the Odin flashing tool which then allows for the rooting to happen.
HOW TO ROOT SAMSUNG GALAXY TAB PRO 12.2 SM-TT900 RUNNING ON ANDROID 5.1.1 LOLLIPOP WITH CHAINFIRE’S CF-AUTO-ROOT
- Download the CF-Auto-Root  tool for the Samsung Galaxy Tab Pro 12.2 SM-T900 tablet running on the Android 5.1.1 Lollipop.
- Navigate to the Downloads folder and open it because it is where your file has ended up unless you have changed the default download location on the Windows operating system.
- Extract the rooting file to the Downloads folder and the Odin flashing executable file and the rooting file are then available for you to use from the Downloads folder.
- Boot the Samsung Galaxy Tab Pro 12.2 SM-T900 tablet into the Download Mode  before connecting it to the computer with the USB cable.
- Run the Odin flashing tool executable file from the Downloads folder so that the flashing tool opens and then check that Odin shows a color coming from the ID: COM port—usually blue or yellow.
- Click on the AP button and then navigate to the Downloads folder where you extracted the rooting file in the beginning and then click on it, so it uploads to the Odin flashing app.
- Click on the Start button and the rooting of the Samsung Galaxy Tab Pro begins.
- Do not touch anything until you can see that Odin has given a pass message inside a green box at the end of the flashing process.
In conclusion, that is how to root the Samsung Galaxy Tab Pro 12.2 SM-T900 tablet running on the Android 5.1.1 Lollipop software updates by flashing the CF-Auto-Root tool developed by Chainfire. The developer is the same guy who developed the SuperSU that many people flash from a custom recovery image and both methods result in the same thing which is having the SuperSU installed and enabled on the device in question. You can see the SuperSU available from the app drawer as soon as your tablet reboots, and you need to leave it on the device if you are to remain rooted.