These are the instructions to root Samsung Galaxy Mega 5.8 using CWM recovery on Windows Computer.
Requirements: Your Samsung Galaxy Mega 5.8 should have at least 60-70 percent battery to perform the rooting process.
Root Samsung Galaxy mega 5.8 I9150
Step 1: Download and install Samsung Kies on your Windows Computer. In case Samsung Kies is already installed then skip this step.
Step 2: Download and extract root files on your computer. After extracting you will be able to see following files:
Step 3: Now, using Data Cable Copy SuperSU v1.34.zip file to the Phone SD memory.
Step 4: Now, Switch off your phone.
Step 5: After switching-off the phone, you need to boot into Download Mode. To boot into download mode Press and hold Volume Down Key, Home Button and Power key at same time for 5-8 seconds until download mode is active.
Step 6: In the Download mode you will be able to see a Warning Yellow Triangle Sign. In this situation you have to press the Volume up key to continue.
Step 7: Now, Open Odin3 (You have extracted this in Step#2) on your computer. Then connect your phone to the computer.
Step 8: Once you have connected the phone to the computer, Odin will automatically recognize the device and show “Added” message at the lower-left panel.
Step 9: Once your device is detected by Odin, click on the “PDA” button and select the recovery.tar.md5 file that you have extracted in Step #2.
Step 10: Now, click on the “Start” button in Odin to begin the Flashing process.
Step 11: Once you see, the Green Pass message in Odin, you can disconnect your Device from the computer. During this process your phone will restart automatically.
Step 12: Now, again switch off your phone.
Step 13: Now, you have to enter into the recovery mode on your phone. To enter Recovery Mode Press and Hold Volume Up Key, Home Button and Power Button for 5-8 seconds until you boot into recovery mode.
Step 14: Under recovery Menu, using Volume Key navigate Install Zip from sdcard > Choose Zip from sdcard > Yes, install SuperSU v1.34.zip.
Step 15: Once Flashing is done, select Go Back >Reboot System Now from the recovery menu.
Step 16: Now your device is Rooted. To check whether your phone is rooted correctly, open your Applications Menu, there you will be able to see a new app installed, called SuperSU. If this app exist then it means you have successfully rooted your Samsung Galaxy Mega.
Points to remember:
[*] No data loss process: Your Phone Data like contacts, pictures, videos, music and etc will be not affected with this method.