In order to work effectively, a smartphone need a firmware that controls how this device operate, it commonly contains an Android OS, Samsung or third parties apps. An AT&T Samsung Galaxy S5 unmodified official stock firmware is the firmware for the device with the model number SM-G900A. The firmware can be found in the system partition, though hidden it’s writable, so we can replace it with a new firmware.
If you are loves to flash mods as well as custom ROMs, we extremely recommend you to obtain one or more stock firmware for your AT&T Galaxy S5, because you never know when a bad thing comes to your phone. So, when something bad happens, you no longer need to be stressed, because you already have a first aid to recover your phone.
Some people find it hard to get a stock firmware because the file size is pretty massive for the size of a phone firmware. The AT&T Galaxy S5 stock firmware file size is around 1.8GB packed in a zip, so the actual file size is definitely larger than that. This is all because of too many apps that come preinstalled on this device, which explains why the file size of a custom ROM like CyanogenMod ROM is much smaller.
Odin compatible stock firmware for AT&T Galaxy S5 (SM-G900A)
The Galaxy S5 premiered in April 2014, and has been sent out worldwide, each and every device in several countries has an identical hardware, That’s the reason why the firmware is only suitable for a specific model number. However, the AT&T variant has SM-G900A model number.
And here is the list of SM-G900A stock firmware that compatible with Odin:
Well before download, check out your model number and software version on Settings -> About then take a note of it. Always make sure that the firmware version is identical to your current software version, flashing newer version of firmware in some cases possible, but downgrade is likely to fail.