Seems you have done enough efforts to get you phone alive. But, have you tried a battery replacement. May your phones battery is old enough to hold the charge. Here I must include, no matter how recent you have purchased the battery/phone, modern Li-ion battery loses the charging cycle rapidly if you charge and recharge it rapidly. As per the “emmc failure” , it has nothing to do with charging. However, it can cause you Galaxy get hotter while using or charging it.