How to update iOS 11.4.1 to iOS 13.5.1

1. When you perform an iOS update procedure, you always download/install the most recent (supported) iOS version (now 14.4.2).
2. iOS version 11.4.1 is very old, and you might find difficulties in updating wirelessly (via wifi). Should be this case, I suggest that you update it using a computer running iTunes (PC) or iTunes/Finder (Mac).
3. Depending on your iPhone model, see this list for compatibility.

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See: Update your iPhone, iPad, or iPod touch - Apple Support

Your ability to update will be determined by the model of iPhone you have.

Note that no model of iPhone can be updated to iOS 13.

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