First do this to reset your flash counts so when you take your phone back to Sprint they won't know you were monkeying around with what you shouldn't be. And yes I do believe you will be taking your phone back as I don't think returning your phone to stock will make you happy. I think you are just in an area that is having data issues. It happens.
[NOTE]Always check your current count state in download mode prior to using triangle away. If what Triangle Away and what is shown in download mode doesn't match, do not proceed.[/NOTE]
You will be will be resetting your phone with an app called triangle away, which has just been updated to support all US versions of the GS3. Click on the link below to download triangle away.
Click here To download
Triangle Away
Please thank
Chainfiire for developing this great app.
Installation instructions and how to use it are in QBKING77's Video Below.
After you have performed the steps above. You are ready to return to stock. The following method will return you to stock much easier than the way you linked.
Go into Recovery and wipe cache, dalvik. Then just flash this rom in custom recovery and it removes root (superuser), busy box and custom recovery. Nothing could be easier. If your phone gets stuck and won't boot. Boot into Factory recovery (yes CWM will be gone) and factory reset your phone in stock recovery. Then you will be back to 100% stock fully updated phone.
Easy Return To Stock
Or if you want to use Odin, Below is the same EXACT method used in galaxys3root.com
Here's a one file one flash method to return to stock. This will return you phone to a
stock unrooted state without removing your apps or data. While you will need your drivers
and Odin desktop loaded, you will only be flashing a single file to your phone.
Drivers
Your Samsung Drivers MUST be installed correctly on your computer prior to continuing. You
can install them by installing keis.
Intalling Kies or
Just the drivers alone
Either way wait until the software installs completely before plugging your device into the
computer. When you have completed driver installation, plug in your device. The computer
should now tell you it is installing drivers click on the details and wait until there is a
green check by all the drivers. Unplugging your device before it's complete will cause you
problems.
Preparing Your Computer
You will need to download the following files to your desktop or notebook computer. Just
click on the file names and that should download the file required. I would suggest you
make a folder on your desktop and name it something like Root GS3
Odin 3.07
KIES_HOME_L710VPALEN_L710SPRALEN_618049_REV03_user_low_ship.tar.md5
After downloading the above files to your computer:
1. double click on the "Odin 3.07 zip". Copy the "Odin307" folder into your "UnRoot GS3"
folder.
2. double click on the
"KIES_HOME_L710VPALEN_L710SPRALEN_618049_REV03_user_low_ship.tar.zip"
And Copy
"KIES_HOME_L710VPALEN_L710SPRALEN_618049_REV03_user_low_ship.tar.md5 and the " SS_DL.dll"
files to the UnRoot GS3 folder.
In other words, extract the tar file
from the zip and copy it to the UnRoot GS3 folder.
Using Odin
1. Open the "Odin307" folder and right click on "Odin3 v3.07.exe" and choose run as
administrator. Odin will open.
2. place your phone into download mode. Turn off phone - press and hold volume down, home
button and power button at the same time. When you see the warning push the volume up
button to continue.
3. Plug your usb cord to your phone and computer and wait until you see any number and com
in the com
4. Check the PDA block and browse to
"KIES_HOME_L710VPALEN_L710SPRALEN_618049_REV03_user_low_ship.tar.md5" in your UnRoot GS3
Folder
5. Verify Auto Reboot is checked as well as F. Reset Time
When all this is setup Odin should look like this:
6. If everything looks like the picture, click on the start button in Odin.
Note: This is vary large file and make take up to 10 minutes to complete.
When the phone leaves download mod and starts to reboot you can remove the usb cord.
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