I have only ever updated via my iPhone. I went to go do the more recent 2.50.2 version and it fails every time I try to start it. I have closed the app, re opened it, deleted it and re installed it. I have tried factory resetting the amp and no matter what I do it fails every time I try to start it. Is there any way to fix this without having to go pick up a usb cable and update off the laptop?