G920AUCS6DQC1 AT&T Galaxy S6 SM-G920A Android 6.0.1 Marshmallow Firmware with March Security Updates

AT&T Galaxy S6 SM-G920A Official Android 6.0.1 Marshmallow firmware version G920AUCS6DQC1. The G920AUCS6DQC1 is the last Android Marshmallow released build version before the Android 7.0 Nougat upgrade landed to the latter
DeviceGalaxy S6 SM-G920A
Android version6.0.1 Marshmallow
Android security patch levelMarch 1, 2017
Baseband versionG920AUCS6DQC1
Kernel version3.10.61-9462607
Build numberMMB29K.G920AUCS6DQC1
Release dateMarch 27, 2017
ChangesMarch 2017 Android security updates
Stock firmware(Link)
You may also check for latest firmware build release here: Galaxy S6 SM-G920A Android 7.0 Nougat Firmware TIPS:  You may only use the most latest firmware update as it includes several system improvements and security enhancements. These includes but not limited to, such as apps and features, WiFi connectivity, signal strength,  camera, audio and video quality. Read the Guide : How to Install Galaxy S6, S6 Edge & S6 edge+ Stock Firmware

How to Use the Stock Firmware?

Stock firmware can only be use to restore back a Galaxy S6 SM-G920A (AT&T) to the original Android operating system images if the device has been modified in unauthorized way and if the device no longer receives the OTA updates. FOLLOW THIS GUIDE: Install Galaxy S6, S6 edge, and S6 edge+ Factory Stock Firmware 1. Backup all important data stored in the device memory, including contacts, messages, photos, videos, music, and other files. 2. Recharge the phone or it should still have at-least around 50% remaining power. 3. Grab these tools: – Odin3_v3.12.103 (Nougat) – Odin3_v3.11.1 (Marshmallow) – USB driver or grab Smart Switch 4. Extract the firmware package in your PC. 5. Open or run Odin3 in your computer. 6. Reboot the Galaxy S6 in Download mode. Turn Off the phone then press and hold down the Volume Down+Power+Home keys at the same time. You may then press the Volume Up key to continue. 7. Connect the phone to PC. 8. Load the stock firmware: a. Single tarball – Click on AP button and load the stock firmware tarball. b. Multiple tarball – Load each individual stock firmware tarball such as BootloaderAPCP, and CSC on Odin3’s designated slots. 9. Click the “Start” button to begin the installation. 10. Wait until the flashing completely finishes and the phone reboot itself. You may also do perform a full factory data reset to regain a cleaner and fresher firmware installation. Just ensure that you already made a backup all of your important data stored in the phone.