Mi iPad doesn’t want to update
How to update my tablet
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The regional Apple update servers continue to be heavily loaded following release of iPadOS - and this is causing difficulties for some in updating their devices. You may need to be patient - as you should be able to update when server capacity becomes available.
These support pages may be helpful:
Update your iPhone, iPad or iPod touch – Apple Support
Update software on iOS and iPadOS devices in iTunes on PC - Apple Support
If your iPhone, iPad or iPod touch won’t update - Apple Support