Download KitKat 4.4.2 Android stock firmware for Jiayu S3s smartphone from here or here. Download another Jiayu firmware from here.
Firmware details
Archive name: S3S-20150204-164258线刷
Image: S3S-20150204-164258
Archive file size: 562 MB
Model: Jiayu S3s smartphone with 3GB RAM
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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