For iOS 14 the update downloaded but won’t let me install
Why it’s not letting me install the update or press the agree button
iPhone XR, iOS 14
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Try restarting the phone and try again.
Update – Can’t or can’t restore
Have you tried using iTunes on a computer or Finder if running Catalina to do the update?
Update software on iOS devices in iTunes on Mac
If you see an error when you update or restore your iPhone, iPad, or iPod