how do i reinstall ios or ipados?
how do i reinstall ios on ipad air
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Restoring your iPad to Factory Settings will completely reset the iPad - and install a fresh copy of the most recent version of iOS/iPadOS that is supported by your iPad.
Restore your iPhone, iPad or iPod to factory settings – Apple Support
You’ll need access to either a PC (with iTunes installed) or a Mac (with iTunes or Finder - as appropriate for the installed version of MacOS).