Unroot android

Unroot Sprint Galaxy S4 SPH-L720/L720T Tri-Band, fully return back to Stock Official Firmware

If you have Sprint Galaxy S4 that you need to unroot this guide covers on how to fully unroot it, this will work either you have the original SPH-L720 and or the SPH-L720T Tri-band version.  Once you unroot your phone it regains a fresher and cleaner start, as the phone restores back to the way it was before you  have had put some modification on it such as rooting. This will completely  restores your  Galaxy S4 SPH-L720T back to its original factory stock firmware. This will also help if you have been struggling getting the latest OTA update and receive an error that says something like, “Your Device have been modified, software update is not available’ then let assume that the error says the truth.  This simply means that the official software updates cannot get through to phone running on a modified firmware as it will initiate some consistency check if the device is still runs on official firmware or not.

So just read on as this  this guide will show you the rest of the process to unroot your Sprint Galaxy S4 (SPH-L720 and SPH-L720T) and then restore it back to a clean factory stock settings.

Things needed to Unroot Sprint Galaxy S4 L720 and L720T

  • Make sure to recharger your Galaxy S4′s battery as it might cause undesired issues when the power goes down.
  • Stock ROM packages comes in two formats the ‘Full-Wipe’ (delete your stored data after flashing) and the ‘Non-Wipe’ (it doesn’t delete your phone’s stored data) but it is highly recommended to make a back up all important files stored from your phone’s internal memory – contacts, messages, etc.  before flashing no-matter if it is Full-WIpe or Non-Wipe,  just to be safe and ensure that your stored data are in  safe  if something went wrong during the flashing process.
  • Remember or back up the APN settings of your device. ( This only done if you try to install other regions stock ROM.
  • Use a PC or laptop that runs in Windows OS, with a good and perfectly working USB serial port.  Odin will not work on MAC OS.
  • Use the supplied USB cable for your Galaxy S4.
  • Enable USB debugging from your phone’s settings. Go to Settings > About Phone> then look for the build number and tick that build number starts with KOT49H for around seven times until a pop-up message appears saying you are now a developer.
  • Ensure that KIES is closed and not running in the system tray! Kies will interrupt and doesn’t like Odin, it will block you from flashing.

Download the needed tools for flashing

Grab your Sprint Galaxy S4  Original Firmware

What is a Stock Firmware?
Stock Firmware are the software updates that has been released from Samsung Kies official firmware server. These are being pulled and carefully re-bundled it to make it flashable by using Odin flasher tool. This is useful to create custom ROMs, root kernels, fixing bricked devices, unrooting and restoring back to original factory firmware.

You should only grab the right stock firmware package that match the build details of your current rooted firmware.  As set of example here for Galaxy S4 SPH-L720;
If your phone currently runs on a  rooted 4.4.2 L720VPUFNG2 then only install back the original L720VPUFNG2. Same goes on the Tri-band Galaxy S4 SPH-L720T, if you have a rooted L720TVPUBNC6 then only install back the original L720TVPUBNC6 stock firmware. Just always check your phones firmware build details accordingly before you grab the  stock firmware as there is always a newer software updates builds releases.

Please note that the SPH-L720T stock firmware cannot be flashed on SPH-L720, as it will just result into failure as both has different hardware and software built-in features.

Galaxy S4 Stock Firmware Choose SPH-L720 or SPH-l720T if you have the tri-band version. Also grab Odin3_v3.09  and the USB driver at the bottom of the page)

Install the USB Driver and Extract the downloaded stock ROM

Install the USB Driver first to get rid of flashing failures. Also  need to extract the downloaded file which is packed in zip or rar files, so that you’ll get the tar.md5 file.

Run and Configure Odin

Run Odin downloader Odin3_v3.07 on your PC desktop. Watch out the check-boxes options on the right top of Odin, ensure that the ‘RE-PARTITION’ is unchecked, only  the ‘AUTO-REBOOT and ‘F.RESET TIME’ checkboxes are both remained checked.

Reboot your Galaxy S4 into Download Mode

To reboot the Galaxy S4 into  download mode , you need to turn the power off.  After it completely shut off,  just  press and hold the Volume Down key,  Home button and the Power ON/OFF button simultaneously.

You should then prompted into a warning screen and asking you  to press volume up if you want to continue or volume down to cancel, just simply press volume up to get into download mode. The download mode then displays an Android robot and say’s “Downloading.. Do not turn off target!!”

Connect your Phone to PC or Laptop

Once you already reboot the phone in download mode,  simply connect the phone to your PC or laptop USB.
In Odin window – the ID:COM box will turn to blue color and indicates the COM port number and a word “Added” on a log box will prompt you that the device is already detected or recognized by Odin. Your COM port number might be different from mine. If you do not see a COM port number then there’s something missing or wrong. You may read again from the top of this post.

Load the binary .tar.md5 file

T he stock firmware comes in a single file only.  Now, you need to just simply click on the AP button, then browse to the folder where the .tar or .tar.md5 you have previously extracted and then select and load it.
example: Kies_Home_L720VPUFNG2_L720SPRFNG2.tar.md5

Flash the stock Firmware

Once if all set and ready to fire-up, hit the “START” button in Odin to begin flashing the stock firmware.
Do not ever interrupt the phone while already in flashing progress, like disconnecting the cable or turning off the device. Just wait until it completely finish.

Wait until it says PASS!!

When the stock firmware installation successfully completes, you will then see a word “PASS” in Odin. This indicates that the flashing was already finish, and on the log box it says “All threads completed. (succeed 1 / failed 0)”. The phone will just then automatically reboot, then it’s time to remove it from PC or laptop USB connection.

Confirm if you successfully unroot your Sprint Galaxy S4 (SPH-L720/SPH-L720T).

Confirm the fresh firmware installed. Go to Settings>About Phone>Firmware info.

Possible errors that you might encountered, this is based on my own experience while flashing stock ROM on Samsung Android devices. These are just a few hints on how to resolved it.

Q: I got an error message that says “Set-up connection Failed” ?
A: 1. Check your USB connection from the phone to PC,
2. Connect to another PC USB port
3. Check and try to another USB cable
4. Re-install the USB driver.
Q: Odin just suddenly stuck in the middle of nowhere while in flashing progress, It isn’t responding at all?
A: Check for possible program that might interrupt the process, like disabling the anti-virus and closing any running programs.
Try to use another PC or laptop,
Q: I experienced bootloop or the phone just stuck on Welcome Logo (phone always stop at bootanimation) and it won’t boot normally?
A: You can fix it via recovery mode option, do this:
Boot in recovery mode
1. Press and hold Volume Up, Home and Power button.
2. Use volume keys to select, Up and Down and Power or Home key to select the option
3. Select Wipe Data/Factory Reset using the Home button.
4. Next select the Wipe Cache Partition
5. Lastly, select Reboot System Now to reboot your Galaxy S4 in Normal mode.

That’s it!
Anymore questions? leave it on the comment form below

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