my 9 year old Son Jack entered the passcode incorrectly more than 10 times and ipad mini disabled. Used Apple support, powered off, forced connection and connected to itunes, used ipad restore which all went well then at the end restore error 4013 couldnt restore. Switched to another laptop same thing happened. But now stuck on connect to itunes and cant power off. I dont know the serial number - please help? Thank you so much - Julie