These are the steps to unroot the Samsung Galaxy Alpha. Unrooting is the step to take when you want to restore the stock Android Lollipop ROM on the Samsung Galaxy Alpha. It means you will no longer have the root access you had earlier. Furthermore, you cannot install any of the root-requiring apps from the Google Play Store.
The Files You Need
- Download the SM-G850F stock ROM from this page.
- Download the Samsung USB Drivers.
- Download the Odin flashing tool from this page.
- The following guide only works if you have the SM-G850F model number. You can check that model number at any time by heading to the Settings > About Device. If you attempt to flash this file on a different device, you might brick the device.
- You need a Windows PC to use this guide. The Odin flashing tool works on all versions of Windows apart from Windows RT with the Microsoft Surface.
Unrooting Samsung Galaxy Alpha (SM-G850F International)
- Unzip the stock Android Lollipop firmware for the Alpha.
- Drag and drop that same Lollipop firmware file from the folder to the desktop. You can only see the firmware after you extract/uznip the folder.
- Unzip the Odin flashing tool. Once you have unzipped the Odin tool, you can double-click the mouse over the file and run the flashing tool.
- By this time, you should have the firmware on the desktop and Odin already running waiting for us to connect the Samsung Galaxy Alpha.
- Long-press the Power button on the Samsung Galaxy Alpha to turn it off completely.
- Hold the Power + Volume Down + Home keys to reboot the Alpha in download mode.
- Keep pressing the same three keys until you see a warning screen.
- Once you get the warning screen, take your hands off the three keys and press the Volume Up button.
- Pressing the Volume Up button by itself should now get you past that warning screen.
- Sweet, now your Alpha is in download mode and ready to connect to the computer.
- Connect the Alpha to the computer using the same USB cable you use for charging the device.
- When done correctly, the ID: COM port in Odin should change color. If you don’t see any color change, you should download the Samsung USB drivers. If you are sure you already did that, it probably means your computer wants a reboot. You can reboot and try again.
- Once you see the color change, click the AP button in the Odin flashing tool. Those of you using an older version of Odin will need to press the PDA button instead.
- Browse the desktop for the Lollipop firmware file we prepared earlier.
- Click the Start button and wait for the firmware file to flash on your Samsung Galaxy Alpha.
- You may unplug from the computer when you see it says your device passed on Odin’s display.