The AT&T Samsung Galaxy Alpha (G850A) can finally be rooted with KingRoot after a long wait of 2 years. The Samsung Galaxy Alpha launched way back in September of 2014 with Android Kitkat 4.4.4. With a 4.7 inch HD display and 2GB of RAM the device performed significantly well.

However, true performance of an Android smartphone can only be unlocked once it is rooted. Rooting your Galaxy Alpha will the user to flash different Custom MODs, ROMs and such stuff onto the device. And it took about a year after the device was released for the smartphone to get CyanogenMod 13.

While rooting this device, you are advised to proceed with great caution as any carelessness from your part will render the smartphone as bricked. Fixing a bricked device is not impossible but extremely difficult.

Downloads

How to Root AT&T Galaxy Alpha G850A

Download the two APK files from the downloads section above to your AT&T Galaxy Alpha.
Go to Settings » Security » and enable “Unknown Sources”.
Now install KingRoot 4.81. A message will pop up saying that the app is malicious. Nothing to worry about here, continue by clicking “Install Anyway”.
Now open the KingRoot app and click Root. The phone will reboot. Open the app again and the process will continue till it’s over. That’s all there is to it. Your device is now rooted. However, it is necessary to replace KingRoot with SuperSu.
Install the second APK called SuperSume. Once the app is installed, click on the big green button to enable root access, and it will replace KingRoot with SuperSU in about a minute.
Next open Play Store and update SuperSU. After it’s done updating, open the app and a message asking to update the binaries will pop up. Click “Continue” then “Normal”. Do NOT click TWRP/CWM, or it will Softbrick your device.

That’s it. Your AT&T Galaxy Alpha is now rooted. To verify, download/install any root checker app from the Play Store.

If you wish to unroot or go back to the way Samsung and AT&T meant it to be, then just flash over the Galaxy Alpha Stock firmware.

via xda