Download latest KitKat 4.4 Android stock firmware for Jiayu S3 3GB smartphone from here or here. Download previous firmware from here.
Firmware details
Archive: mt6752_h560_s3s_jyt_cc_kk_lte_5m-cs_ldata_tphone_user_lidekai_20150113140405
Image: mt6752_h560_s3s_jyt_cc_kk_lte_5m-cs_ldata_tphone_user_lidekai_20150113140405
Archive file size: 526 MB
Model: Jiayu S3 3GB smartphone
Support: Mediatek MT6752
Project: vanzo6752_lwt_kk
Config_version: V1.1.2
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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