This is an old iPad 4, and tried to login. But the 4 digit passcode has been forgotten. After 6 times trying, then the iPad has been locked out. It has never been connected to PC before. And it is displaying message "IPad is locked out, so try again in 5 minutes" When tried again after 5 minutes, it locks up again displaying this time "Try again in 1 hour" and it keeps going that way. What is best way to unlock this? Maybe in the end it need to be factory reset? = losing all the data? Thanks in advance.