I have the same issue, nothing helped. Tried 10 diffetent usb sticks, formatted in fat32, fat16, exfat, from 2 to 32 gb, even tried new wire, notjing helped, but usb stick diod is blinking, that means that there is power in the usb. Anybody knows how can I flash corolla e210 panasonic multimedia without inserting usb stick in multimedia usb socket? And there is another usb white socket on the back side of multimedia? It is not connected to anything. May be it will work? But there is different type on socket, cant find adaptor to that. Ty