Anyone who wants to unroot/unbrick their Galaxy S4 they can easily by using Odin and the correct stock firmware for their AT&T SGH-i337 Galaxy S4. With this step-by-step guide it will show you how to completely unroot your AT&T Galaxy S4, remove any custom recovery and unbrick your phone if you are in a boot loop.
Follow the guide below to unroot/unbrick AT&T Galaxy S4 SGH-i337.
1. Enter your phone into "Download Mode". Make sure your phone is unplugged and turned off. Hold the volume down, home center, and power button at the same time. When you feel a vibration let go of the power, but keep holding onto the volume down and home button.
2. Press the volume up to continue and plug in your phone via microUSB.
3. Download Odin, pit, and tar.md5 files using the links below.
Download Odin
Download JFLTE_USA_ATT_16G.pit
Download AP_I337UCUEMK2_1921628_REV06_user_low_ship_MULTI_C ERT.tar.md5
4. Unzip and open Odin3 v1.85. In Odin you should see a yellow highlighted box on the left of the program. If you don't, download and install Samsung USB drivers.
5. Click on "PIT" then locate and select "JFLTE_USA_ATT_16G.pit"
6. Click on "PDA" then locate and select AP_I337UCUEMK2_1921628_REV06_user_low_ship_MULTI_C ERT.tar.md5.
7. Now click on "Start". The entire process will take about 5-10 minutes.
8. Once Odin is complete it will say "Pass". Now unplug your phone.
9. You will now see a Android figure on your screen. Wait till you see "Samsung Galaxy S4" and then take out the battery and put it back in.
10. Now enter into Recovery Mode. Hold the volume up, home center, and power button at the same time. When you feel a vibration let go of the power, but keep holding onto the volume up and home button.
11. Select "wipe data/factory reset" > "Yes".
12. Then "reboot system now".
13. You are now on stock Android! You are unrooted, on stock recovery, and unbricked! You can now send this to Samsung/AT&T without them knowing you ever modified with your phone.
Credits - XDA
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