If you're unable to unlock your iPad even after troubleshooting, simply follow these steps to erase your device and restore ...

Recovery Mode: Connect iPad to a computer > open Finder (Catalina or later) or iTunes > restart > Update from the recovery screen. If you don't have access to a computer, use iCloud to wipe the iPad ...

Clear options for restoring access using Apple tools ...

If you're having trouble with your iPhone or iPad - if it's stuck on the Apple logo or a black screen, for example, or you can't get it out of recovery mode - this reliable iOS system recovery ...