2021 iPad Air will not update to 16.3.1
For some time I have been trying to update my iPad Air to 16.3.1 with no success. I have access to solid wifi, I have 2/3 of device memory available, it is certainly new enough to accept the update, and allowing it enough time to download has not been a problem. I have connected it to my iMac and tried to download the update that way with not success- just endless spinning so that it appears to be downloading but never gets anything accomplished. There is not discernible reason for this to be happening! I found a thread that suggested turning off automatic downloads and shutting the device down before manually requesting the update. Still get the same error message. Suggestions on how I might resolve this would be appreciated. Thanks!
iPad, iPadOS 16