1. AC Question's Avatar
    I have followed this process more then Five times which is mentioned below:
    1. Download Samsung Kies and back up your phone data. Remove the microSD card from your phone if you have one. Make sure your phone has a good charge (at least 50%).

    2. Download the firmware you want to downgrade to at SamMobile dot com slash firmwares. (All S5s are model number SM-G900x, with the x corresponding to your carrier. Look up the model number for your carrier's phone - example, SM-G900V is Verizon, SM-G900P is Sprint, etc.) You'll probably want the latest 4.4.x version. The file will be in .zip format and will be 1.5 - 2 GB large, so be patient.

    3. Once the download is complete, extract the firmware file to a place you will remember, like a folder on your desktop.

    4. Download Odin from a reputable source like Softpedia or another site that tests its downloads for malware.

    5. Make sure your phone is off and disconnected from your computer.

    6. Open Odin. Under Options, only "Auto Reboot" and "F. Reset Time" should be checked.

    7. Click the "AP" (or "PDA") box and browse for the extracted firmware file.

    8. Press and hold the following buttons in order: Volume Down + Home + Power. Keep holding them until you see a screen that says "Warning!!" at the top.

    9. Press the Volume Up button to continue.

    10. The next screen will show the Android logo and say "ODIN MODE" at the top left.

    11. Now connect your phone to your computer via USB.

    12. In Odin, look to the top left and wait until you see in the leftmost box "COM" followed by a colon and a number, such as "COM:4". The number doesn't matter. Once you see that, you can proceed.

    13. In the Message box in Odin, you should see several lines of text.

    14. Press Start in Odin.

    15. Odin will begin processing, and on your screen you will see "Downloading" with a status bar underneath.

    16. When Odin is successfully finished, you will see in the Message box "All threads completed".

    17. Your S5 should begin rebooting. You can disconnect from the computer.

    18. If your S5 reboots successfully into good old 4.4, you're done! You can re-insert your microSD card. If your data is gone, connect to your computer and restore with Samsung Kies.

    But it is not rollingback.
    09-17-2015 08:49 AM

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