AT&T has launched the new and official Android 8.0 Oreo OS upgrade for all its Samsung Galaxy S8 users. Check the instructions in this post in order to learn how to manually update your phone.

The Android 8.0 Oreo official update is being rolled out in stages, and that means that not everyone will get the new files at the same time. If you do not wish to wait until the Oreo update reaches their phones, then you will have to manually install the new firmware using the ODIN tool.

Before you can begin the updating process you will have to check the following guidelines.

Preparation steps:

Use the guide only for the AT&T Samsung Galaxy S8 smartphones.
The model of your device has to be the SM - G950U1.

Do not use the tutorial for any other different Galaxy S8 smartphones.

Download and install the Samsung USB Drivers from here on your PC.

For the updating process you will have to use the Odin tool, and for Odin to work with your computer you will need to install the drivers above. Also, you will have to enable the USB Debugging option from the Developer Options menu.

If you cannot find Developer Options you will need to enable that menu first. Get to Settings> About Phone> Software Information and here you have to tap 7 times on the Build Number text. Get back to Settings and Developer Options will now be listed there.

You can install Android 8.0 update with Odin over rooted firmware, but you need to know that root access won't survive the update process. Also, any custom Recovery you might have flashed is going to be replaced with stock Recovery.

Odin is also capable of flashing the new Android 8.0 update over custom ROMs, but you have to know that an extra factory reset process has to be applied after the installation is done. The Factory Reset steps are listed at the end of the guide.

The Factory Reset steps are going to help you remove the old custom ROM, and force your smartphone to boot in normal mode. Note that no data will be lost from the internal storage of your device.

If your Galaxy S8 AT&T device runs on 100% stock Android firmware, then you can get to the next part of this post, as no data will be lost in the process.

Read the whole post and and do not skip any steps.

This guide has to be used by advanced users, we cannot be blamed in case you brick the phone nor in case you lose any important data files.

How to install Android 8.0 Oreo OS Update for AT&T Samsung Galaxy S8 devices:

  1. Download the Android 8 G950U1UEU2CRB9 Oreo firmware archive from here.
  2. When the download is done you have to extract the archived contents. Save the files obtained on your PC.
    - there will be six different G950U1UEU2CRB9 tar.md5 update files, don't unzip them.
  3. Download Odin 3.12.3 zip from here.
    - when the download is done you can extract the contents and save them on your PC.
  4. Switch off the device.
  5. Boot the Galaxy S8 AT&T in Download Mode.
  6. Launch Odin exe on your PC.
  7. Connect the phone to computer via usb cable. Wait for Odin to detect the phone.
    - if the phone is not added you need to reinstall the Samsung usb drivers.
  8. Go to Odin's main screen and start loading the update files.
    Click AP and load the G950U1UEU2CRB9 tar.md5 file with AP in the title.
    Click BL and load the G950U1UEU2CRB9 tar.md5 file that has BL in the name.
    Click CP and load the CP G950U1UEU2CRB9 tar.md5 file.
    Click CSC and load the G950U1UEU2CRB9 tar.md5 file with HOME_CSC in the name. Don't load the file that only has CSC in the title without HOME, that CSC-only file will tell Odin to wipe clean the device.
  9. Press START when you're ready to begin the Android 8 Oreo update process.
    - wait for the update to be completed and then get to the next step.
  10. When the update is done you can see the PASS message shown by ODIN, and the phone will reboot in normal mode.
    Reboot the Galaxy S8 in normal mode.
    Unplug the phone from PC, use your default login info and you're done with this post.


If Odin shows the FAIL alert, or in case other error blocks the installation of Android 8.0 Oreo update, then you will have to repeat the installation once again. If you repeat installation you need to make sure that your phone meets all requirements, and that you won't skip any steps listed above.


If ODIN shows the PASS alert, but the Galaxy S8 enters in a boot loop, or it gets stuck at the boot animation screen for more than 20 minutes, then you will need to Factory Reset the device. This will force it to boot in normal mode.

The Factory Reset process will wipe clean the system partition removing all installed apps. Also, these steps should be followed by those that have installed the update over a custom ROM, too.

Here's how to factory reset the Galaxy S8 AT&T using Recovery Mode:

  • power off the Galaxy S8.
  • boot it in Recovery Mode.
  • select 'wipe data/ factory reset'.
  • confirm.
  • reboot phone in normal mode when done.

If you need more help you can tell us in comments below.

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