Samsung Galaxy Win Pro DUOS (SM-G3812B) Firmware Overview
What is the latest SM-G3812B firmware?
G3812BVJUAPK1, released January 21, 2017 for region ZTM with Android 4.2.2. The archive holds 3 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 January 2017, so Android 4.2.2 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 ZTM
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.