This tutorial uses CF-Auto-Root file released by Senior XDA-Developers, Chainfire. Head over to the CF-Auto-Root main thread to learn more about the root method.
Disclaimer: Rooting voids the warranty of your device. We and the developer of this rooting procedures shall not be held responsible if any undesirable outcomes may happen to your device. use of this root guide is solely at your own risk!
Pre-requisites
1. Install USB Drivers for Samsung Galaxy Tab 3 8.0 on the computer.
2. Enable USB Debugging Mode on the tablet by navigating to Settings >> Developer Options.
3. Make a backup of all your important data before following the guide.
4. Ensure the battery of the tablet is charged more than 80 percent.
5. The CF-Auto-Root files works only on the Galaxy Tab 3 8.0 with model numbers SM-T310 (Wi-Fi), SM-T311 (3G), SM-T312 (3G), SM-T315 (LTE) and SM-T315T (LTE). Applying these to any incorrect variant might brick the device. Verify the model number of the Galaxy Tab 3 8.0 by navigating to Settings >> About Phone.
Files Required
1. CF-Auto-Root for SM-T310 (Wi-Fi), SM-T311 (3G), SM-T312, SM-T315 (LTE), SM-T315T
2. Odin 3.09
Steps to Root Galaxy Tab 3 8.0 Running on Android 4.2.2 Jelly Bean Firmware
Step 1: Extract the CF-Auto-Root and Odin 3.09 files using WinRAR/7-Zip/WinZip or any other extracting tool.
Step 2: Switch off the Galaxy Tab 3 8.0. Then boot into Download Mode by pressing and holding Volume Down, Home and Power buttons together until a construction Android robot icon with a warning triangle appears on screen. Now press the Volume Up button to enter Download Mode.
Step 3: Launch Odin on the computer as an Administrator.
Step 4: Connect the Galaxy Tab 3 8.0 to the computer using USB cable while it is in the Download Mode. Wait until Odin detects the device. When the device is connected successfully, the ID: COM box will turn to light blue with the COM port number. Additionally, the successful connected will be indicated by a message saying Added.
Step 5: In Odin, click the AP button and select the CF-Auto-Root .tar.md5 file.
Step 6: Make sure that the Re-Partition checkbox is NOT selected in Odin.
Step 7: Double-check and click Start button in Odin. The installation process will now begin.
Step 8: Once the installation process completes, your tablet will restart and soon you will see a PASS message with green background in the left-most box at the very top of the Odin. You can now unplug the USB cable to disconnect it from the computer.
Samsung Galaxy Tab 3 8.0 running on Android 4.2.2 Jelly Bean is now rooted successfully. Open the app drawer of the phone and check for an app called SuperSU. Verify the root status of the device by downloading Root Checker app from Google Play Store.
Note: Many Samsung devices store a flash counter that keeps track of how many times you have flashed custom firmwares to your device. Triangle Away can be used to reset the flash counter to zero.
How to Fix "Unfortunately, SuperSU has stopped"?
Step 1: Download and install the latest APK of SuperSU on your device.
Step 2: Open SuperSU app (update the binary if prompted) and allow it to disable KNOX.
Step 3: Reboot your device.
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