I recently updated to ios9 and it now wants a passcode. I've tried to restore via DFU mode, however iTunes no longer lets you JUST "restore" - you now have to "Restore & Update" which puts me right back to needing a passcode. I either never set one up, or it was 10 years ago when I first go the iPad. My apple ID and other "usual" passcodes I might have used don't work. I tried a second time doing restore and now just get an error message. Ideas??
Looks like I got it...I noticed my iTunes would say there was no updated version available, but the latest version to download (new) from the website was a higher version number. So I re-installed iTunes on my computer and it seemed to work! Yay!
The only option will be to wipe your iPad (restore it to factory settings). Apple talks about this on their support site: https://support.apple.com/en-us/HT204306
You'll want to restore the phone, but not restore the backup.