Download Android Jelly Bean 4.1.2 stock firmware for Samsung Galaxy Ace 3 Duos TD GT-S7278U smartphone from here or here.
Firmware details
Archive name: S7278U_ZMUANC2
Image: CODE_S7278UZMUANC2_1507487_REV00_user_low_ship.tar.md5
Archive file size: 390 MB
Caution: Please do not update firmware unless you know what you are doing, you really want it or it is absolutely necessary. Firmware updates may occasionally have bad results, like bricking your device, temporarily or permanently. The firmware update process is done entirely at your own risk. Before attempting to update the firmware, back up your data.
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