If you are using a Mac, you should press "Option" and click on the "Update" button simultaneously.
If you are using a Windows PC, you just press "Shift" and click on the "Update" button simultaneously. Link your iPhone to the computer via a USB cable and run the iTunes app. Choose your device and download the latest IPSW file for your device. Open a browser and visit the website. To do this, you should follow the steps below. However, you need to use the iTunes app to apply the firmware. 
If you have a computer with internet access right now, you can download it without iTunes by visiting, a website that allows you to download any version of iOS IPSW file to your iPhone. Method 2: How to Update iOS without iTunes Using IPSW Downloader
Now the iOS software downloading will begin. Enter your iPhone's passcode and agree to the terms and conditions. Once the update is available, tap on "Download and Install". On your iPhone, open "Settings" and choose "General" > "Software Update". The following are the specific steps of how to install iOS without iTunes over the Air. The entire update process may take 10-20 minutes, depending on the stability of your Internet. You just need to make sure that your iPhone is connected to a stable Internet connection and has enough power and storage space. This way of updating iOS only needs to be done on the phone, without running iTunes. Method 1: How to Update iPhone without iTunes over the Air iOS System Recovery: Get iPhone Back to Normal Status. Easy Way to Delete iOS Update on iPhone. iTunes failed to download an iOS update. When updating iOS, iTunes error 1671, error 4013, and so on are displayed. iTunes shows a timeout during the process of downloading and updating the software. iTunes cannot recognize the latest iOS update. "How can I update my iPhone without iTunes"? Many people are reluctant to use iTunes to update iOS, because they always encounter this or that kind of problem when using iTunes to update iOS automatically. Why Not Use iTunes to Update Your iPhone? Method 3: How to Install iOS without iTunes Using iOS System Recovery. Method 2: How to Update iOS without iTunes Using IPSW Downloader. Method 1: How to Update iPhone without iTunes Using WiFi. Why Not Use iTunes to Update Your iPhone?.
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