When I try to do the software update it says cannot complete update. Retry does not work
I get an error message when it is trying to software update
iPad, iPadOS 15
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Assuming you're trying to update your device wirelessly, and bearing in mind that to perform an update procedure wirelessly, you need to connect your device to a reliable and fast Wifi Network with internet access (no cellular data, unless you use a 5G network, no personal hotspot on your device, no VPN connections are admitted, and I suggest that you keep the device plugged into power during the whole update process), see this suppport article:--> If your iPhone, iPad or iPod touch won’t update
If the issue persists, try to update it via computer:
Learn how to update your device manually if you're using a Mac with macOS Catalina or later, or if you're using a Mac with macOS Mojave or earlier or a Windows PC.
If you still get no help, contact Apple Support directly, using this link:--> Get Support
Regards
Giulio