- You must have the Samsung Galaxy Grand 2 LTE with the model number SM-G7105L to use this guide. Any other model number will get bricked if you use the same CF-Auto-Root file featured in this guide. You can find out what your Samsung Galaxy Grand 2’s model number is by tapping on the Menu > Settings > About Device > Model Number.
- The CF-Auto-Root one-click rooting package found in this guide for the Samsung Galaxy Grand 2 smartphone is based on the KOT49H.G7105LUBUBNJ5 firmware which is part of an Android 4.4.2 Kitkat software update that rolled out to some regions. It does not mean you need to be running that same software update on your Samsung Galaxy Grand 2 LTE smartphone. You just need to use it as an indicator, since some of the Samsung devices will not boot old images.
BEFORE WE BEGIN
- Download the Samsung USB Drivers  for your Samsung Galaxy Grand 2 LTE smartphone and install them on the Windows computer you plan on using during this guide. The drivers must be up to date for the Odin flashing tool to recognize your device when it is running.
- You may need to unlock the Developer Options menu on the Samsung Galaxy Grand 2 smartphone by tapping on the Menu > Settings > About Device > Build Number 7 times.
- You should enter the Developer Options on your Galaxy Grand 2 and enable the USb Debugging Mode by tapping on the Menu > Settings > Developer Options > USB Debugging Mode.
HOW TO ROOT SAMSUNG GALAXY GRAND 2 LTE SM-G7105L RUNNING ANDROID 4.4.2 KITKAT
- Download the CF-Auto-Root for the G7105L on Android 4.4.2 KitKat from this link .
- Download the Odin flashing tool from this link .
- Extract the files on the desktop of the computer.
- Long-press the Power button on the Samsung Galaxy Grand 2 smartphone and turn off the device.
- Reboot the Samsung Galaxy Grand 2 in download mode.
- Connect the Samsung Galaxy Grand 2 to the computer with the USB cable.
- Click the PDA button or the AP button from the Odin flashing tool’s user-interface and upload the Galaxy Grand 2’s tar.md5 file that is on the desktop.
- Do not make any changes to the default settings you get with the Odin flashing tool after you first open the file.
- Click the Start button and the Odin flashing tool will install and enable the SuperSU on your Grand 2 via the Cf-Auto-Root tool.
- Look over at the display of your Samsung Galaxy Grand 2 smartphone and wait until it says it is about to reboot in 10 seconds.
Watch for the Samsung Galaxy Grand 2 to reach recovery mode automatically and if that doesn’t happen you need to boot it in recovery mode yourself by holding the Power + Home + Volume Down Up buttons.
Sometimes new software updates can bring in new bootloader which prevent the kernels from booting. If your device fails to boot it is likely due to that problem. You can report the problem to Chainfire from the official CF-Auto-Root thread  over at XDA Developers.