I cannot update
I am not able to update iOS 16
iPad, iOS 12
Question marked as
When devices get too old they cannot be updated to the newest system. The hardware is not sufficient to run newer systems. If your iPad is running iOS 12 then it may be amount that group.
Here's two different ways to ensure the highest iOS that your iPad will support is on your iPad.
Update your iPhone, iPad, or iPod touch wirelessly. Click here --> Update your iPhone or iPad - Apple Support
Update your iPhone, iPad, or iPod touch with the Finder on a Mac computer --> Update your iPhone, iPad, or iPod touch with the Finder - Apple Support