Ipad Erase All Content And Settings Passcode. Tap on Erase All Content and Settings. Tap Reset All Content and Settings to erase your iPad.
Here is the detailed instruction. Go back to Settings and tap General Reset Erase All Content and Settings. So you should also hard reset your iPhone and then try resetting the device via the Settings App.
Here is the detailed instruction.
To avoid losing any important data youll want to make sure you back up the device to iCloud before resetting it. Select Erase All Content and Settings. Just scroll down to Reset. If youre asked to enter your passcode and youve forgotten it see Reset the passcode.