Download Android Jelly Bean 4.3 stock firmware for Samsung SCH-i939D Galaxy S3 Duos smartphone from here or here. Download previous firmware from here. Download another Samsung firmware from here.
Firmware details
Archive name: SAMSUNG_I939D_4.3_fw_20151208
Image: SAMSUNG_I939D_SJDS_ROM_20151208
Archive file size: 524 MB
Build number: m0ctcduos-user 4.3 JSS15J I939DKEUBOA1 release-keys
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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