Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
iOS 5.1 is released, and Apple is still signing iOS 5.0.1 for now, but doesn't look like it could go anymore wrong for you at the moment.

I have never seen when a DFU restore fails to resolve an issue. The only time I have seen the progress bar stuck like that is when the /etc/hosts file has been modified to include gs.apple.com - but you've tried different machines right? All with the latest iTunes, and an unmodified hosts file?
 
same exact problem here with an ipad2 restoring iOS 9.0.2
someone solved? prior to the restore the iPad worked without problem
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.