system restore
I have messed up my I pad Air. Can I system restore to the day before ? ( I use Safari )
iPad Air, iOS 8.4
If you have a backup, you can.
How to back up your devices using iCloud or iTunes - Apple Support
Also, you may try restarting it or resetting the settings. This won't delete the data, however, may help you to bring your iPad back to working condition.
- Press and hold the Sleep/Wake button
- Press and hold on the Home button
- Keep holding both buttons until the display turns off and back on with Apple logo on it.
Alternatively, you may go to Settings - General - Reset - Reset All Settings