How install 15.1 to iPhone 7 IOS13.1.1

erdenetsetseg81 wrote:

How install IOS 15.1 to iPhone 7 with IOS 13.1.1

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

What is the difficulty faced by you?

iOS 14

bayaraa16 wrote:

iOS 14

Unless your iPhone is already on iOS 14, then all you will see as available software update is latest release of iOS 15 (on a compatible device).