My iPad doesn't update at iOS 8.0.1?

If you can’t update or restore your iOS device

http://support.apple.com/kb/ht1808

iPad Stuck in Recovery Mode after Update

http://www.transfer-iphone-recovery.com/ipad-stuck-in-recovery-mode-after-update .html

 Cheers, Tom 😉

what model is it Model 1? (iOS 8) does not support

also how much memory (you may have to remove some to free up space (you can reload latter)