
Samsung Galaxy S7
The latest firmware for Samsung Galaxy S7 (SM-G930A) is G930AUCUBCTB1, released on February 11, 2020 for 1 region (CSC). Every official firmware build for SM-G930A, 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/G930AUCUBCTB1
The newest build, G930AUCUBCTB1, was released on February 11, 2020. No new build has appeared for 81 months, so regular updates for this model have most likely ended.
Specifications of SM-G930F, a regional variant of the same device. Chipset and SIM lines are left out: they can differ by region.

SM-G930AZK

SM-G935TZK

SM-G928A

SM-G925A

SM-G920X
The latest build for SM-G930A, G930AUCUBCTB1, was released on February 11, 2020 (6 years ago).
SM-G930A has had no new firmware for 81 months, so regular updates have most likely ended.
Yes, all firmware files for SM-G930A are 100% official, original, and obtained directly from Samsung servers.
To flash SM-G930A, 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-G930A.