Install stock Marshmallow G925AUCU5DQB3 on AT&T S6 Edge G925A

AT&T is on the roll with the latest security updates for multiple devices bonded with it. AT&T Galaxy S6 Edge SM-G925A is getting February security patch from AT&T, the update is arriving as build number G925AUCU5DQB3 and based on Android 6.0.1 Marshmallow. The February security update for AT&T S6 Edge also improves call improvements and AT&T messages backup and synchronization options. The update will soon hit your device or directly look for it, go to Settings > About device > Software updates.

If the update appears via OTA then it’s the great thing else try the Kies method. We have also mentioned the process to update G925AUCU5DQB3 Marshmallow update via Odin. The same tutorial for the Sprint S6 Edge update is used as well earlier so the process remains the same because it has nothing to do with the change build number or Android version, all you need is an Odin tool along the firmware tar and a PC with latest Samsung USB drivers installed on it.

You can also greet welcome to the new firmware using Samsung Kies, here we have posted a guide to update firmware via Kies on AT&T S6 Edge G925A

Firmware details:

Device Name: Samsung Galaxy S6 Edge (AT&T)

Model: SM-G925A

Version: Android 6.0.1 Marshmallow

Build Number: G925AUCU5DQB3

Android Security Patch Level: 1 February, 2017

How to install Marshmallow G925AUCU5DQB3 on AT&T S6 Edge G925A via Odin

Disclaimer: Follow the guide on your own risk, the writer would not be responsible if you damage your device during the firmware installation process nor we are forcing you to perform the flashing process. Don’t proceed if you can’t follow the instructions carefully.


Your device should be charged 70% at minimum to avoid shutting down during the process.

Enable USB Debugging. Go to Settings > Developer Options > Enable USB debugging

Install latest USB drivers for Samsung on PC. Download

Download the firmware from the link provided at the end of post.

Then extract the firmware file in a specific folder on your PC.

Process to flash UCU5DQB3 Marshmallow firmware on AT&T S6 Edge G925A

Now turn off your device completely.

Reboot your device into Download Mode, to do so follow this guide

Once in download Mode, follow this guide to update the firmware via Odin.

That’s it! If you have successfully updated your AT&T S6 Edge G925A on G925AUCU5DQB3 Marshmallow firmware, give us your feedback.


Download the Android 6.0.1 Marshmallow G925AUCU5DQB3 firmware for AT&T S6 Edge G925A