Download KitKat 4.4.4 Android stock firmware for Jiayu S3s smartphone from here or here. Download previous firmware from here. Download another Jiayu firmware from here.
Firmware details
Archive name: S3SN-20150612-181316卡刷
Image: update.zip
Archive file size: 543 MB
Model: Jiayu S3s smartphone with 3GB RAM
Support: Mediatek MT6752
Project: vanzo6752_lwt_kk
Build number: H560-user 4.4.4 KTU84P eng.scm.1434103830 test-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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