If you can't update or restore your iPad - Apple Support
https://support.apple.com/en-us/108925
1.Make sure that your Mac is up to date. If you're using iTunes, make sure you have the latest v…2.On a Mac with macOS Catalina, open the Finder. On a Mac with macOS Mojave or earlier, or on a PC, open iTunes. If iTunes is already open, close it, then open it again. Find out which macOS your Mac is using. 3.Connect your iPad to your computer using a USB cable.4.Keep your iPad connected and wait until the recovery mode screen appears:
1.Make sure that your Mac is up to date. If you're using iTunes, make sure you have the latest v…2.On a Mac with macOS Catalina, open the Finder. On a Mac with macOS Mojave or earlier, or on a PC, open iTunes. If iTunes is already open, close it, then open it again. Find out which macOS your Mac is using.
3.Connect your iPad to your computer using a USB cable.4.Keep your iPad connected and wait until the recovery mode screen appears:
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