Download Android 4.4.2 KitKat ROM for JIAYU G4S smartphone from here or here. Download previous firmware version from here. Download another Jiayu firmware from here.
Archive name: G4S-20141022-222444高配版4.4线刷
Archive file size: 505 MB
Model: JIAYU G4S smartphone
Support: Mediatek MT6592
Project: vanzo92_cwet_kk
Config_version: V1.1.2