Bought this phone very cheap with lines on half of the screen and the volume down is inoperable was told. And i was told phone is fully functional. I dont have the phone yet but will this week. Can i still use volume in settings? Can this line issue be fixed if factory reset it or firmware upgrade? Can this phone be rooted without PC if i cant get volume down to work? Maybe adjusting brightness would help a little? or move all apps to middle somehow?