I'm trying to download IOS 7 on my Iphone 4s but it's not working! I keep seeiing an apple with a line underneath it, like it's installing but the line doesn't change at all! Every 10 seconds I see this little circle that you get when you have to wait, but that's it! I can't put my phone off and I can't put it in DFU mode. This is going on for about 20 hours now! Any Idea what I can do?