Apple just this week stopped signing iOS & iPadOS 17.2.1, 17.2, and 16.7.4 in a move that prevents iPhone and iPad owners from downgrading their device’s firmware from the newer iOS & iPadOS 17.3 that was released just last week.
iOS 17.2.1
Install iOS 17.2.1, iPadOS 17.2.1 and macOS Sonoma 14.2.1 to get security patches
Aside from unspecified bug fixes and security patches, there are no new user features in iOS 17.2.1, iPadOS 17.2.1 and macOS Sonoma 14.2.1.