Why can’t I install the new version
Why can’t I install the update on low iPad Air 3
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If you're sure it is an iPad Air 3rd generation (supporting the current iPad OS 14.4.1) and you can't update it, see this support article:--> If your iPhone, iPad or iPod touch won’t update
If you get no help, try to update it using a computer running iTunes (PC) or iTunes/Finder (Mac).
If the issue persists, contact Apple Support using this link:--> Get Support
Regards
Giulio