We do not recommend flashing the CF-Auto-Root file just after a new software update has rolled out. New a software updates sometimes require Chianifire to unlock the bootloader again before the rooting method will work. He makes those updates to the same file that is in the post, but it can take a few days before he finds out about what file needs updating.
- You must have the Samsung Galaxy Alpha with the model number SM-G850F to follow this guide.
- The CF-Auto-Root package in this post is based on the LRX22G.G850FXXU2COI3 firmware which is part of Android 5.0.2 software updates. You do not have to be running that same build number. Chainfire will update the tool to continue working with new software updates past that build ID. However, we only recommend you follow this guide for Android 5.0.2 to make sure you do not ever brick your device.
BEFORE WE BEGIN
- Download the Samsung USB Drivers  for the Samsung Galaxy Alpha and the Windows computer from our USB Driver download page.
- Unlock the hidden Developer Options menu on your Alpha by tapping over the Menu > Settings > About Device > Build Number. Keep tapping that build number for at least seven times and it will say on the display when it thinks yo are a developer.
- Enter the Developer Options and enable the USB Debugging Mode by tapping over the Menu > Settings > Developer Options > USB Debugging Mode.
HOW TO ROOT SAMSUNG GALAXY GRAND PRIME RUNNING ON ANDROID 5.1.1 LOLLIPOP
- Download the CF-Auto-Root package for the Galaxy Alpha from this link .
- Download the Odin flash tool from this link .
- Extract both files on the desktop of the computer by right-clicking the mouse and choosing the “extract here” from the menu.
- Double-click and launch the Odin executable file on the desktop.
- Long-press the Power button and the Samsung Galaxy Alpha to turn it off and reboot it in download mode .
- Plug the Samsung Galaxy Alpha smartphone into the computer with the USB cable.
- Click the PDA button from your Odin user-interface.
- Browse your desktop for the tar.md5 file that you extracted earlier.
- Click the Start button and the Odin app on the computer will flash that tar.md5 rooting exploit on your Galaxy Alpha.
- Keep a look out on the Samsung Galaxy Alpha’s display for when it says your device is rebooting in 10 seconds.
The Samsung Galaxy Alpha smartphone will now reboot in recovery mode; that’s important or else your smartphone will not be rooted. You must manually reboot the device to recovery mode — stock or a custom recovery — if you are to have a rooted device. You can do that by turning off the Alpha and booting it up by holding the Volume Up + Home + Power buttons.