Before Starting the update, make sure your device is plugged into your computer

and that your computer is connected to the internet

If you're using a Mac with macOS Catalina or later, 

open the finder.

If you're using a Mac with macOS Mojave or earlier 

or a Windows computer open iTunes

You might receive a notification when a new update is available

Which you can click to start the update process

Otherwise, locate your device in the sidebar

and make sure you're in the General tab

Next, click update

Then click update again and follow the prompts

When the update is complete your iPhone will restart.

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