samsung G355H/DS dead not done

dear sir ..i am new..i have a samung G355H /DS is spd cpu based phone..set dead after flash before it was working…good ..after flash not found usb..not conecting..anything so please, how to solve it problem..and when i do connect jtag then after comes it please suggest me.. all emmc pinouts is well power supply,charging pin with battery without battery ..i had been cheked..:confused