
Samsung Galaxy Win Pro
The latest firmware for Samsung Galaxy Win Pro (SM-G3812) is G3812ZNUAOH1 with Android 4.2.2 (Jelly), released on August 19, 2015 for 1 region (CSC). Every official firmware build for SM-G3812, 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/G3812ZNUAOH1
All 4 builds in our database run Android 4.2.2 (Jelly). The newest build, G3812ZNUAOH1, was released on August 19, 2015. No new build has appeared for 136 months, so regular updates for this model have most likely ended.

SM-G3819

SM-G388F

SM-G386W

SM-G3858

SM-G390W
The newest firmware for SM-G3812 runs Android 4.2.2 (Jelly): build G3812ZNUAOH1, released on August 19, 2015.
The latest build for SM-G3812, G3812ZNUAOH1, was released on August 19, 2015 (11 years ago).
SM-G3812 has had no new firmware for 136 months, so regular updates have most likely ended.
Yes, all firmware files for SM-G3812 are 100% official, original, and obtained directly from Samsung servers.
To flash SM-G3812, 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-G3812.