Update AT&T S5 Active G870A on G870AUCS2DPK4 stock Marshmallow firmware

Monthly security updates are now rolling out for the Samsung devices bonded with AT&T. The update is live via OTA and has landed for AT&T S5 Active SM-G870A, carries January’s security patch along multiple improvements and bug fixes. In this guide you will see the process to install stock Marshmallow based G870AUCS2DPK4 firmware on AT&T Galaxy S5 Active G870A. First give a try to OTA, go to Settings > About device > Software updates.

This guide is also helpful if you are using custom ROM and want to revert back to stock firmware or if you have accidentally brick your device then the only option left to get your device back to life is, flashing stock firmware via Odin. Odin method is also helpful if your device is rooted then no OTA will knock at your device so either you have to un-root it or flash the update via Odin.

Note: We have already posted similar guide along same process for Samsung’s latest flagships 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.

Firmware details:

Device Name: Samsung Galaxy S5 Active [AT&T]

Model: SM-G870A

Version: Android 6.0.1 Marshmallow

Build Number: G870AUCS2DPK4

Android Security Patch Level (SPL): January 1, 2017

Release date: February 1, 2017

Size: 26.2MB

Manually update G870AUCS2DPK4 Marshmallow firmware on AT&T S5 Active G870A

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.

Process to update G870AUCS2DPK4 firmware on AT&T S5 Active G870A via Kies

If you remain unsuccessful in updating your device via OTA then visit the link below to update it via Kies.

Update G870AUCS2DPK4 firmware on AT&T S5 Active G870A via Samsung Kies

Hope this process helped you, still if you find problem with it then follow the guide below to update it manually via Odin tool.

Process to update G870AUCS2DPK4 firmware on AT&T S5 Active G870A via Odin


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

Download and extract Odin 3.12.3 from here

Process to update firmware via Odin.

Now turn off your device completely.

it’s the time to boot your device into ‘Download Mode’, to do so follow this guide

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


Download the stock Android 6.0.1 Marshmallow G870AUCS2DPK4 tar firmware for AT&T S5 Active G870A.

The link will be updated soon till then keep trying the OTA or Kies.

That’s it! If you have successfully updated your device, give us your feedback and share this post. Thank You.