
Samsung Galaxy S6 edge
The latest firmware for Samsung Galaxy S6 edge (SCV31) is SCV31KDU1CQG1 with Android 7.0 (Nougat), released on July 5, 2017 for 1 region (CSC). Every official firmware build for SCV31, 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/SCV31KDU1CQG1
SCV31 started on Android 6 and has received 1 major Android upgrade; it now runs Android 7.0 (Nougat). The newest build, SCV31KDU1CQG1, was released on July 5, 2017. No new build has appeared for 113 months, so regular updates for this model have most likely ended.

SCV37

SCV36

SCV35

SCV32

SCV39

SCV38

SCV33
The newest firmware for SCV31 runs Android 7.0 (Nougat): build SCV31KDU1CQG1, released on July 5, 2017.
The latest build for SCV31, SCV31KDU1CQG1, was released on July 5, 2017 (9 years ago).
SCV31 has had no new firmware for 113 months, so regular updates have most likely ended.
Yes, all firmware files for SCV31 are 100% official, original, and obtained directly from Samsung servers.
To flash SCV31, 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 SCV31.