I'm unable to update iOS on my iPhone 7
Software update problem issue my pohne not ready issue problem solve
[Re-Titled by Moderator]
iPhone 7, iOS 15
You can update an iPhone 7 as far as the latest release of iOS 15.
About iOS 15 Updates - Apple Support
Update your iPhone or iPad - Apple Support
Updating iOS: common issues and solutions - Apple Community
You cannot update an iPhone 7 to iOS 16 or higher. It is not compatible with those versions of iOS, and will not offer updates to them to you.