Krispy

Hello everyone, I have a problem with my old NW-E405, I haven't used it in a looooong time and apparently it doesn't want to play music anymore. When I press the Play button, nothing happen but when I connect it to my laptop, the screen display "USB Connect" and the player is apparently charging. I can even transfer music in it, upgrade the firmware (though it doesn't do anything as i'm already in 2.0) but when i disconnect it, the screen just stay black... The thing is i think i lost the system files when i accidently formatted it with my laptop and that could be the reason why it doesn't work anymore. So, does anybody still have this device and could upload or send me the system files please? I've look everywhere but couldn't find them... Thanks in advance