I recently got hold of an iPad Air 2 that was sitting in a drawer. Had it recharged, seems to hold the charge. However it has iOS 9.3.1 and it says it cannot upgrade to 13 over the wire.
It requires iTunes and a computer. I also have a MacBook Pro (2014) running Mojave (10.14.6) so I fired up iTunes and connected the iPad via a USB cable.
The iTunes app sees the iPad and recommends upgrading to iOS 13. It asks me if I want backup. Nothing valuable on the iPad so I continue without backup. The iPad locks suddenly (no timeout). Then iTunes app (on Mac) asks me to type the unlock code on the iPad in order to continue. I do that and the iPad unlocks.
Then nothing happens. Neither on the Mac nor on the iPad.
Will provide any other information as necessary. Let me know in the comments.
What gives?