What to when you iPhone XR is saying support.apple.com/iPhone/restore
What to when you iPhone XR is saying support.apple.com/iPhone/restore
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If you follow the directions to look at "support.apple.com/iPhone/restore", the resulting link that appears below provides instructions about what to do.
If you see the Restore screen on your iPhone, iPad, or iPod touch - Apple Support
If this all looks too intimidating, best to make an appointment at the Apple Store or visit an authorized Apple Service shop.