Ipad is disabled
The screen was suddenly completely black and it only appeared the percentage of remaining battery.
I managed to switch it off and it appeared the message that iPad is disabled.
I performed a hard reset and I had same results.
There was no problem with blocking because of wrong passwords.
I think it is because of update of iOS which I did two days ago...bad decision it seems... :(
iPad, iOS 7, I'm not sure which iOS 7(2 days ago