How to install iOS 13.4

No iOS 13.4 update is available.

The iPhone 5s, 6, and 6 Plus cannot run iOS 13 and later. For them, iOS 12 is the end of the line. If you have a really old iPhone, it may not be able to run even iOS 12.

Any iPhone that was capable of running iOS 13.4 – at one time – would now be offered something higher.

If you're referring to an iPhone 6 Plus or earlier, it isn't capable of 13 or above. Otherwise, use a computer or the Software Update function in Settings to install 15.7.5 or 16.4.1.

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How to install ios 13.4

As noted, depending on what phone you have, it is not possible.

iOS 13.4 insstall

It is not possible if you have an iPhone 6 or earlier model.

What model of iPhone do you have?