Samsung Galaxy Win Pro DUOS (SM-G3812B) Firmware Overview
What is the latest SM-G3812B firmware?
G3812BVJUANH3, released September 3, 2014 for region TTT with Android 4.1–4.3. The archive holds 2 official builds for this region.
Is the Samsung Galaxy Win Pro DUOS still getting updates?
Most likely not: there has been no new firmware since September 2014, so Android 4.1–4.3 is the last version this model got. The final builds below are still the best choice for a clean reinstall.
SM-G3812B firmware for region TTT
How to Flash SM-G3812B Firmware
Put the Samsung Galaxy Win Pro DUOS into Download Mode, load the BL, AP, CP and CSC files into Odin on a Windows PC and press Start. Use HOME_CSC to keep your data, CSC for a full wipe.