Samsung Galaxy Ace 3 Duos TD (GT-S7278U) Firmware Overview
The archive lists 3 official builds for the Samsung Galaxy Ace 3 Duos TD across 1 region (CSC). The newest one is S7278UZMUANF1, released July 1, 2014 with Android Bean.
How to Flash GT-S7278U Firmware
Put the Samsung Galaxy Ace 3 Duos TD 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.