My iPhone can’t install update
iPhone XR can’t install upgrade to 15.4. How do I fix this?
iPhone XR, iOS 14
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can’t install upgrade to 15.4.
What message do you get when you try?
You can do the update via PC, see this Apple article: Update software on iPhone, iPad or iPod touch in iTunes on PC
Update software on iPhone, iPad or iPod touch in iTunes on PC – Apple Support (UK)
If you have a Mac see this Apple article: Update your iPhone, iPad, or iPod touch with the Finder
Update your iPhone, iPad, or iPod touch with the Finder - Apple Support