What is the last update for iPhone 7?

youka17 wrote:

How can update it new more than this update

You will never be able to update the iPhone 7 to iOS 16 or beyond. For the iPhone 7, which ran iOS 10 when Apple released it in September 2016 (almost ten years ago), iOS 15 is the end of the line.

If you need to run a modern version of iOS, it is time to purchase a new iPhone (or a Certified Refurbished iPhone from Apple's Web site, if available in your country), and retire your very old iPhone 7.

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That is not possible, the latest software update that you can install is iOS 15.8.8. This is due to hardware limitations

The last software update for the iPhone 7 and iPhone 7 Plus is iOS 15.8.8. 

How can update it new more than this update

This is not possible. The iPhone 7 is not compatible with iOS 16, 17, 18 and 26.

You need a new iPhone.