Update Error 4005
Keep getting error 4005 - how to fix without restoring?
iPad 2 Wi-Fi + Cellular
You've followed the instructions on the page that you posted from, including trying a different computer and cable ? If you have and you still get error 4005 contact Apple :
If you continue to see error 9, 4005, 4013, or 4014 when you try to restore your iPhone, iPad, or iPod touch, contact us.