
Samsung Galaxy Note Edge
The latest firmware for Samsung Galaxy Note Edge (SM-N915V) is N915VVRU2CQL2 with Android 6.0.1 (Marshmallow), released on December 11, 2017 for 1 region (CSC). Every official firmware build for SM-N915V, 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/N915VVRU2CQL2
SM-N915V started on Android 4 and has received 2 major Android upgrades; it now runs Android 6.0.1 (Marshmallow). The newest build, N915VVRU2CQL2, was released on December 11, 2017. No new build has appeared for 108 months, so regular updates for this model have most likely ended.
Specifications of SM-N915F, a regional variant of the same device. Chipset and SIM lines are left out: they can differ by region.

SM-N915T3

SM-N910V

SM-N916S

SM-N920AZW

SM-N900V
The newest firmware for SM-N915V runs Android 6.0.1 (Marshmallow): build N915VVRU2CQL2, released on December 11, 2017.
The latest build for SM-N915V, N915VVRU2CQL2, was released on December 11, 2017 (8 years ago).
SM-N915V has had no new firmware for 108 months, so regular updates have most likely ended.
Yes, all firmware files for SM-N915V are 100% official, original, and obtained directly from Samsung servers.
To flash SM-N915V, 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-N915V.