
Samsung Galaxy S6 Edge
The latest firmware for Samsung Galaxy S6 Edge (SM-G925R6) is G925R6WWU3DRI2 with Android 7.0, released on September 12, 2018 for 1 region (CSC). Every official firmware build for SM-G925R6, 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/G925R6WWU3DRI2
All 2 builds in our database run Android 7.0. The newest build, G925R6WWU3DRI2, was released on September 12, 2018. No new build has appeared for 99 months, so regular updates for this model have most likely ended.
Specifications of SM-G925F, a regional variant of the same device. Chipset and SIM lines are left out: they can differ by region.

SM-G925A

SM-G928A

SM-G920X

SM-G9298

SM-G935TZK
The newest firmware for SM-G925R6 runs Android 7.0: build G925R6WWU3DRI2, released on September 12, 2018.
The latest build for SM-G925R6, G925R6WWU3DRI2, was released on September 12, 2018 (8 years ago).
SM-G925R6 has had no new firmware for 99 months, so regular updates have most likely ended.
Yes, all firmware files for SM-G925R6 are 100% official, original, and obtained directly from Samsung servers.
To flash SM-G925R6, 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-G925R6.