I've literally just bought it, and was planning to put plex on it I cant get the thing into DFU mode, I've seriously tried about 20 times..... I've got this right, its plug in via usb to my mac, and its also plugged in to the main. I hold down and menu for 6 seconds. It reboots. I then hold menu and play, I get a blinking light on the front again, but it doesnt pop up in itunes or anything.