iphone 5s stuck in dfu mode

my iphone was becoming laggy so i restored it from itunes back up .It was fine until then the apps were loading so I left it for some time and after sometime it was stuck in boot loop mode. i tried force starting it and everything and after few hours of boot looping it went in dfu mode and again i tried to restore it in dfu mode but it discconnects after apple logo comes on and says device is disconnected . i have tried everthing non apple software , differnt pc and cable but nothing seems to work . please help me if anyone knows how to deal with this, It would be a great help