Software update version

Rajukpatel wrote:

Latest Software Update for iphone 7 Plus

The final version of iOS for iPhone 7 Plus is iOS 15, and the most recent of that is iOS 15.7.1.

For how to update to that version, see the reply above.

Assuming you have a compatible device, see: Update your iPhone, iPad, or iPod touch - Apple Support

And: If your iPhone, iPad, or iPod touch won't update - Apple Support

If the above Apple articles do not help, please post back with relevant information.