
Samsung Galaxy S6 Active (AT&T USA)
The latest firmware for Samsung Galaxy S6 Active (AT&T USA) (SM-G890A) is G890AUCS7DRF2, released on July 15, 2018 for 1 region (CSC). Every official firmware build for SM-G890A, newest first: one row per build with all regions (CSC) that received it.
Each firmware build has its own page at https://samfirm.shop/build/{PDA}, where {PDA} is the build number from the list above. Example: https://samfirm.shop/build/G890AUCS7DRF2
All 5 builds in our database run Android 5.1.1 (Lollipop). The newest build, G890AUCS7DRF2, was released on July 15, 2018. No new build has appeared for 100 months, so regular updates for this model have most likely ended.
Box codes of SM-G890A for different colors and markets. Firmware is chosen by the model code SM-G890A and your region (CSC), not by the SKU.

SM-G935TZK

SM-G930AZK

SM-G935AZS

SM-G935TZS

SM-G935AZK

SM-G935TZD

SM-G975WC

SM-G975FC
The newest firmware for SM-G890A runs Android 5.1.1 (Lollipop): build G890AUCS7DRF2, released on July 15, 2018.
The latest build for SM-G890A, G890AUCS7DRF2, was released on July 15, 2018 (8 years ago).
SM-G890A has had no new firmware for 100 months, so regular updates have most likely ended.
Yes, all firmware files for SM-G890A are 100% official, original, and obtained directly from Samsung servers.
To flash SM-G890A, you need to download the appropriate firmware, put your device into Download Mode, and use the Odin tool to load the BL, AP, CP, and CSC files.
Downgrading is only possible if the bootloader version (binary bit) of the old firmware matches the current one. Always check the binary version before flashing SM-G890A.