
Samsung Galaxy Note Edge
The latest firmware for Samsung Galaxy Note Edge (SM-N915F) is N915FXXS1DRI3 with Android 6.0.1 (Marshmallow), released on December 13, 2018 for 1 region (CSC). Every official firmware build for SM-N915F, 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/N915FXXS1DRI3
SM-N915F started on Android 4 and has received 2 major Android upgrades; it now runs Android 6.0.1 (Marshmallow). The newest build, N915FXXS1DRI3, was released on December 13, 2018. No new build has appeared for 95 months, so regular updates for this model have most likely ended.
Box codes of SM-N915F for different colors and markets. Firmware is chosen by the model code SM-N915F and your region (CSC), not by the SKU.

SM-N915V

SM-N910V

SM-N916S

SM-N920AZW

SM-N900V
The newest firmware for SM-N915F runs Android 6.0.1 (Marshmallow): build N915FXXS1DRI3, released on December 13, 2018.
The latest build for SM-N915F, N915FXXS1DRI3, was released on December 13, 2018 (7 years ago).
SM-N915F has had no new firmware for 95 months, so regular updates have most likely ended.
Yes, all firmware files for SM-N915F are 100% official, original, and obtained directly from Samsung servers.
To flash SM-N915F, 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-N915F.