
Samsung Galaxy Grand2
The latest firmware for Samsung Galaxy Grand2 (SM-G710K) is G710KKTUBPK1 with Android 4.4.4 (KitKat), released on November 8, 2016 for 1 region (CSC). Every official firmware build for SM-G710K, 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/G710KKTUBPK1
All 7 builds in our database run Android 4.4.4 (KitKat). The newest build, G710KKTUBPK1, was released on November 8, 2016. No new build has appeared for 121 months, so regular updates for this model have most likely ended.
Specifications of SM-G7105, a regional variant of the same device. Chipset and SIM lines are left out: they can differ by region.

SM-G710S

SM-G715A

SM-G720N0

SM-G611S

SM-G610S
The newest firmware for SM-G710K runs Android 4.4.4 (KitKat): build G710KKTUBPK1, released on November 8, 2016.
The latest build for SM-G710K, G710KKTUBPK1, was released on November 8, 2016 (9 years ago).
SM-G710K has had no new firmware for 121 months, so regular updates have most likely ended.
Yes, all firmware files for SM-G710K are 100% official, original, and obtained directly from Samsung servers.
To flash SM-G710K, 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-G710K.