Download latest KitKat 4.4 Android stock firmware for Jiayu S3 2GB smartphone from here or here. Download previous firmware from here.
Firmware details
Archive: JIAYU S3 (2+16) Android 4.4.4 ROM(S3-20150325-102656) (PC+SD card versions)
Image: MP_mt6752_h560_s3w_jyt_cc_kk_lte_5m-cs_mul_tphone_ 20150325-102656_songlixin_PC & MP_mt6752_h560_s3w_jyt_cc_kk_lte_5m-cs_mul_tphone_20150325-102656_songlixin_TF
Archive file size: 1,16 GB
Model: Jiayu S3 2GB 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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