Looks like the iPad can't read the NAND flash memory on the logic board.
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Looks like the NAND flash memory on the logic board has gone faulty.
To repair this it will be very expensive because it requires replacing the memory chip and reprogramming it. In the end you are better off getting another iPad rather than fixing it.
But in case you haven't tried restore the iPad while in DFU mode.
To get into DFU mode:
1. Keep iPad plugged in.
2. If it's still powered on hold the home + power button until the phone shuts off.
3. Immediately switch to holding power button only for 5 seconds
4. After 3 seconds apple logo will appear then start holding home button as well but keep holding power too.
5. Do this for 15 seconds or (to be exact 8 seconds until the phone switches off and a few seconds after keep holding then release, you will know when to release when you hear the connected USB device sound if you have speakers / audio on your laptop / desktop.
Looks like the iPad can't read the NAND flash memory on the logic board.
To repair this it will be very expensive because it requires replacing the memory chip and reprogramming it. In the end you are better off getting another iPad rather than fixing it.
But in case you haven't tried restore the iPad while in DFU mode.
To get into DFU mode:
1. Keep iPad plugged in.
2. If it's still powered on hold the home + power button until the phone shuts off.
3. Immediately switch to holding power button only for 5 seconds
4. After 3 seconds apple logo will appear then start holding home button as well but keep holding power too.
5. Do this for 15 seconds or (to be exact 8 seconds until the phone switches off and a few seconds after keep holding then release, you will know when to release when you hear the connected USB device sound if you have speakers / audio on your laptop / desktop.
More info on how to get into DFU mode:
https://www.youtube.com/watch?v=ujhBn9v3zOo