Samsung Galaxy Trend 3 DUOS (SM-G3502) Firmware Overview
The archive lists 3 official builds for the Samsung Galaxy Trend 3 DUOS across 1 region (CSC). The newest one is G3502ZNUANG1, released August 5, 2014 with Android Bean.
How to Flash SM-G3502 Firmware
Put the Samsung Galaxy Trend 3 DUOS into Download Mode, load the BL, AP, CP and CSC files into Odin on a Windows PC and press Start. Pick a build with the same or a higher Bit than the one installed — a lower bootloader binary will be rejected.