Trying putting it into DFU mode and see if that works.
Enter iPad DFU Mode
Here’s what you’ll need to do:
- Plug the iPad into your computer
- Launch iTunes
- Hold down the Power button and the Home button at the same time
- Keep holding both of these buttons for 10 seconds
- After 10 seconds pass, release the Power button but continue to hold the Home button for another 3-5 seconds
- When in DFU mode, your iPad screen will stay completely black. If you see an Apple logo or otherwise you did not enter DFU mode
- iTunes will notify you that it has detected a device in recovery mode.