In this detailed guide we are going to install G900AUCU4DPC1 latest Marshmallow firmware on AT&T S5 SM-G900A. Stock Marshmallow for Galaxy S5 is released a long time ago but some users remained unlucky to taste the update via OTA. To update your device firmware from OTA, you need to have a clean device by the way clean mean no more rooted and completely stock. The Android 6.0.1 Marshmallow firmware carries build number G900AUCU4DPC1, brought goodies of Doze mode, Now on Tap and more, if you are a little technical minded person then you are not going to face any difficulty while manually flashing the G900AUCU4DPC1 firmware via Odin on Galaxy S5 G900A.
The most toughest job is to find the firmware file that was previously released by AT&T, because once an OTA is released for carrier bonded devices then no firmware file is given on any website or forum just like other devices do. But now we have brought the G900AUCU4DPC1 firmware files for you to update your device via Odin tool. Credit goes the developers at XDA for extracting the firmware file. You must first give a try to the easiest OTA method,
go to Settings >> About phone >> Software updates,
if this method works for you then no need to move forward but if not, then go ahead and follow the guide to update G900AUCU4DPC1 stock Marshmallow firmware on AT&T Galaxy S5 G900A.Odin flashable method is also the easiest one because due to simple interface of Odin everybody can easily operate the tool. All you need is the firmware file i,e G900AUCU4DPC1 and a data cable and PC, connect your device to PC using data cable then run the Odin tool, choose the file and click start.
How to update G900AUCU4DPC1 stock Marshmallow via Odin on AT&T Galaxy S5 G900A
Download Odin 3.12.3 from here.
Latest USB drivers must be installed on your device.
Give us your feedback about the guide and the Marshmallow firmware on AT&T Galaxy S5 G900A.