Procedure for unroot or update in Samsung Galaxy S3 I9300 smartphone:

Procedure to Unroot:

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• First download the appropriate stock firmware to your computer.

• So, once you downloaded the right firmware for your Samsung Galaxy S3 I9300 Smartphone extract the same to get a file with .tar.md5 extension along with some other files.

• Now, again download the Odin3 v1.5. It will help you to install the jelly bean firmware. Extract this too to get Odin3 v1.85.exe file with few other files.

• After that, allow your device to enter into the download mode by pressing and holding the Volume Down button, Power button and Home button simultaneously for upto 10 seconds.

• While you are doing this a warning screen will appear. Then press the Volume Up button to continue to enter into the Download mode.

• Now run the Odin3 v1.85.exe as an administrator.

• Connect the Samsung Galaxy S3 to the computer via USB cable while the device is in the download mode.

• Wait for few minutes until the Odin detects your phone. Once it has been detected by the Odin the ID:COM box on the Odin will turn into yellow color.

• Also the added message will be displayed.

• In case, the added message doesn’t come then try the above mentioned points by using another USB cable or try the one located at the back side of the computer. Again, if doesn’t work then re-install the USB driver.

• After that, select the given below files that are extracted from the stock firmware folder to install on the phone.

• a) Click the PDA button and choose the file with .tar.md5 extension.

b) Click the phone button and choose the file with modem in its name.

c) Click the CSC button and select the file with CSC in its name.

d) Click the PIT button and select the .pit file.

NOTE : Skip the steps b-d if such files are not found.

• Make sure that the Auto Reboot and F.Reset Time checkboxes are selected in Odin. At the same time; uncheck the Re-Partition option. Click it only if a .pit file is being used.

• After that tap the start button in Odin. The installation process will begin thereafter and will take some time to complete.

• Once the process is finished, a Pass message will appear under the Odin. The phone will then restart automatically.

• Once the home screen appears, unplug the USB cable from the phone to disconnect it from the computer.

• Once the phone is up, go to Settings > About Device > Status. If the status says Normal means the device is unrooted. If the status says modified then follow the given below steps.

• Reboot your Samsung Galaxy S3-I9300 into the recovery mode by holding the Volume Up button, Home button and Power button simultaneously until the phone display on the screen.

• After that do a factory wipe then select the wipe cache partition. Once you complete this action, return to the main recovery menu and select the reboot system now to reboot your android device.

• Now, check the download mode again, if it says either No or 0 then the device can send for warranty.

NOTE: Incase, if the mode says “1″ instead of “0″ or “No” the device was having a non-stock kernel. Now root the device, apply the triangle away and then again flash the stock firmware. Now, the flashcounter will be zero but status might show modified. In such case, do a factory wipe and the device will be back to the stock firmware again.

That’s it! Now, your Samsung Galaxy S3-I9300 should be unrooted successfully and running stock official firmware.