Ok, assuming your bootloader is already unlocked, the easiest way to root your device if you want to keep the stock firmware (including recovery partition) is to flash a special modified boot.img called "Superboot r2" that installs su binaries

Root LG G2. Extract the iorootxx.zip file and open the folder. Connect your phone to the computer using a USB cable. If you are a Windows user, double-click the root-windows.bat file. Mac and Linux users can use the “root-mac.sh” and “root-linux.sh” respectively.

Boot the phone into Download mode. Launch Odin 3.07 and connect you phone to computer. Click the PDA button and select “sph-l720-recovery.tar.md5” file. Now click the Start button to install CWM on your phone. When the installation is finished, you will get PASS !/. RESET! message followed by device reboot. Keep the file zipped. 3. Connect the Zmax to the computer with the USB cable. 4. Transfer the Framaroot file to the internal storage SD card of the phone. 5. Unplug the ZTE phone from the computer. 6. Open the file manager application and tap on the rooting file to open.

Root succeeded N7100 4,4,2 After flashing root fileand finish and boot after restart. go to google play and update supersu then run it and update it normally . after it being updated it will try to disable Knox. it will take long time.. just reboot your device and run supersu and itwill ask you to disable Knox. chose OK. and done. proof in

How to Root your Android 4.4 KitKat device using TowelRoot. Step 1: Head over to TowelRoot.com and click on the lambda icon to download the TowelRoot app. Step 2: Install the TowelRoot app on your phone and open it. Tap on “ Make it Ra1n ” and wait for a few seconds for the app to root your phone. Here is a list of Phones Compatible that
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how to root android 4.4 2