How can I unlock an IPad from 2016

if you forgot the passcode If you forgot your iPad passcode - Apple Support

if you forgot your appleID password If you forgot your Apple ID password - Apple Support

you can try DFU mode to Restore - Apple Community

and maybe try another computer and or another cable and

maybe dirt or lint in the ios devices port when that happen to me I clear it out with a

match or toothpick