iOS 11.3.1 improve the security of your iPhone or iPad and addresses an issue where touch input was unresponsive on some iPhone 8 devices because they were serviced with non-genuine replacement displays.
Note: Non-genuine replacement displays may have compromised visual quality and may fail to work correctly. Apple-certified screen repairs are performed by trusted experts who use genuine Apple parts. See support.apple.com for more information.
For information on the security content of Apple software updates, please visit this website:
You can download iOS 11.3.1 from here:
● Where To Download iPhone Firmware Files From
● Where To Download iPad Firmware Files From
● Where To Download iPod Touch Firmware Files From
Please follow iClarified on Twitter, Facebook, Google+, or RSS for updates.