Lire sur http://ipadpilotnews.com/2017/09/pilots-guide-ios-11/

extrait

When you decide you’re ready to update, the first thing to do is back up your device using iTunes or iCloud, following these instructions. Next make sure your device’s battery is charged and you are connected to the internet via Wi-Fi, and go to Settings > General > Software update, and tap the Download and Install button.