Why not update iOS 14 in my iPhone
Update iOS 14 in my iPhone
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The answer depends on which iPhone you have. If you have an iPhone 5, 6 or 6 Plus, then the hardware is not capable of updating to iOS 14. If this does not answer your question, then please reply to tell us which iPhone you have, what its current iOS is and what happens when you try to update.
Update your iPhone or iPad - Apple Support