
Samsung Galaxy Mega2
The latest firmware for Samsung Galaxy Mega2 (SM-G750F) is G750FXXU1AOE2 with Android 4.4.4 (KitKat), released on May 12, 2015 for 2 regions (CSC). Every official firmware build for SM-G750F, 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/G750FXXU1AOE2
All 3 builds in our database run Android 4.4.4 (KitKat). The newest build, G750FXXU1AOE2, was released on May 12, 2015. No new build has appeared for 139 months, so regular updates for this model have most likely ended.
Box codes of SM-G750F for different colors and markets. Firmware is chosen by the model code SM-G750F and your region (CSC), not by the SKU.

SM-G750H

SM-G766U

SM-G850X

SM-G730V

SM-G556B
The newest firmware for SM-G750F runs Android 4.4.4 (KitKat): build G750FXXU1AOE2, released on May 12, 2015.
The latest build for SM-G750F, G750FXXU1AOE2, was released on May 12, 2015 (11 years ago).
SM-G750F has had no new firmware for 139 months, so regular updates have most likely ended.
Yes, all firmware files for SM-G750F are 100% official, original, and obtained directly from Samsung servers.
To flash SM-G750F, 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-G750F.