You can download iOS 15.4.1 IPSW firmware files for all devices from this page. This firmware file can be restored with iTunes if and only if it is still being signed by the time you download. Note that our website provides firmware directly from Apple's server using the ipsw.me API.
IPSW, iPhone Software, is a file format used to install iOS, iPadOS, tvOS, HomePod, and most recently, macOS firmware for devices equipped with Apple silicon.
iOS 15.4.1 Release notes
- The battery may drain more quickly than expected after updating to iOS 15.4
- Braille devices may become unresponsive while navigating text or displaying an alert
- Made for iPhone hearing devices may lose connection within some third-party apps