To get started, you'll need a
computer, either a Windows PC or a Mac that's running the most recent operating system. You'll also need to download and install the most recent version of iTunes on your computer.
Important note: Back up your iPhone as much as possible before doing a system restore. After the restoration, you may need to utilize parts of your existing contents again. However, you may back up your
iPhone X to iCloud or iTunes in advance. You're ready to start once you've secured these prerequisites and established a backup of your data.