Since currently (as of writing this post) there’s no stock firmware available for AT&T Galaxy S5, you can use a SafeStrap Recovery backup to restore your AT&T Galaxy S5 SM-G900A. Now, this is the Android 4.4.2 ND3 firmware, it will only work if you have not upgraded your bootloader past ND3 most likely.
Tagged: android 4.4.2
For those of you who rooted your T-Mobile Galaxy S5 and couldn’t update to the latest NE6 Android 4.4.2 update using OTA (over-the-air), you can just grab the Android 4.4.2 NE6 Stock ROM zip file made by XDA user BeansTown106.
This is 100% exact same version you can use to install using CWM or TWRP recovery, that way you don’t have to unroot or install stock firmware, both which can take a long time to do.