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This is a full UNROOTING tutorial for Samsung galaxy devices, reset flash counter to bring the warranty back.
"Samsung devices store a flash counter that keeps track of how many times you have flashed custom firmwares to your device after rooting"
This process is very important if you would like to send your device to warranty

Requirements :
~ Charged and Rooted Samsung galaxy S3
~ Triangle Away App on your device
~ Official firmware (Download from SamMobile or Samsung-updates)
~ Odin3 (Link below)
~ Installed Samsung Kies software or Samsung Mobile driver on PC (Link below)

Un-Rooting instructions :
Read all and watch video first

Backup your data first because all data on your device will be deleted
1- Download and install "Triangle Away" App (Link below)
2- Open "Triangle Away" ... (it will ask for root permission ... Accept)
(You should see message like this "Please confirm your device is this exact model GT-I9300")
3- Tap continue
(The App will download some data Select "Download" and wait ...)
4- Choose "Reset flash counter" and "Continue"
Your device will restart into special mode
5- Volume up to continue
6- While rebooting ... quickly Remove the battery and back it again
7- Start your device into "Download mode" (Volume Down + Home + Power)
8- Volume up to continue
9- Flash the official firmware for your galaxy device by Odin
- After the flashing and configuration process finish quickly Unplug USB cable , Remove the battery and back it again
10- Start your device into "Recovery mode" (Volume UP + Home + Power)
11- Choose "Wipe data/factory reset" then "Yes" and wait ...
12- Choose "Wipe cache partition"
then "Reboot system now"
Done !
Now check your "Device status" , It should be "Normal" :)
Notes :
~ "Triangle Away" may unmount your SD card , you can mount it from storage settings
~ status can only be reset on some firmware for the new devices like SGS3/SGNote2/SGNote10.1
~ This process works for various Samsung galaxy devices like (S3/2,Note1/2/10.1",Tab)
~ "Triangle Away" does work on some (not all) stock firmwares.
~ Resetting counter value doesnt work on custom firmwares
~ Some devices set the counter to 1 at every boot if you are running a custom kernel or recovery
On these devices, Triangle Away may always display 1, make sure to check the counter in actual download mode 
~ I am not responsible if something bad happened to your device (use this AT YOUR OWN RISK)
~ Step 2 : If you continue and this is not your device model, you will brick your device 
~ After you finish this process, you will be able to receive the OTA updates ;)

Downloads :
Triangle Away Store or XDA thread
Odin3_v3.04 HERE, v3.07 HERE, v3.09 HERE 
Latest Samsung Mobile Driver HERE
Latest Samsung Kies HERE

1- Unzip FW.zip file only one time and Odin

2- Run Odin as administrator then click on PDA and navigate to "FW.tar.md5" file

3- Put your device into download mode (Vol down+Home+Power then Vol up)

4- Connect your device to PC and wait until you see a sign in Odin (Added in message box)

5- Click Start button in Odin and wait a few minutes until Odin display PASS!

Some supported devices (not all) :

and more .....