Download latest 4.4.2 stock Firmware for Jiayu S2 smartphone
This firmware is for Jiayu S2 smartphone with Mediatek MT6782 CPU 
Download latest 4.4.2 stock Firmware for Jiayu S2 smartphone from here or from here. Download previous firmware version from here.
Firmware details
Archive name: F2-20150311-211700
Image: MP_mt82_l807_f2s_jyt_cc_kk_ds5_lte_5m-cs_tphone_20150311-211700_songlixin_PC
Archive file size: 430 MB
Platform: Mediatek MT6582
FW version: Android KitKat 4.4.2 stock
Project: vanzo82_lwt_2s_kk
Config_version: V1.1.1
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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JiaYu S2 or JiaYu F2 ???