Hi there and welcome
It is missing system files so it needs to be connecting to iTunes
If you do not have it already on your computer, install it (free) from www.itunes.com
Once installed, open it and then connect the iPad to the computer
Wait for iPad to come up with a message which will be it needs to update.
Allow it to do this and when it has, it should then be working again
I can also do these steps for you, and have made a request via Additional Services. This is optional, and if you choose to do this, I can, with your permission, remote into your computer while you watch and do all these steps (and deal with any problems that arise during them) for you. Or if you do not choose to take this service, we can continue here. This is no problem at all. Just let me know please.
Else let me know the results please