Apple ID Verification fails-can't reset iPad
I'm getting an old iPad ready to sell and want to erase content & settings. Can't do it (and can't simply reset or do anything), however, because when I enter my Apple ID password verification fails.
Question 1 - does it need to be connected to wifi for me to reset?
Question 2 - how can I log in if I'm entering it right and it's rejected? (I checked, yes, it's the right Apple ID and password)
iPad 2, iOS 7.1.2