Operations:
Step1: Open the “Safari” app on your iPhone, and then you need to download this firmware: https://oldcat.me/web/NOOTA9.mobileconfig (Or you can download this firmware on PC → sent it to iPhone’s default email app → open it ).
Step2: You need to enter iPhone’s power-on password and install this firmware on your iPhone according to the instructions. After you click “Install”, your iPhone will restart automatically.
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Step3: After it’s installed, iPhone’s desktop will show you a “Feedback” app. You can move it into a folder.
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At this moment, your iPhone can not check the new iOS version. In addition, you can recover OTA update by doing the following operations: open the “Settings” of your iPhone → click “General” → find and delete this description file “tvOS 10 beta Software Profile”.
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Note:
*This description file will automatically disappear on 13th,May,2019.
*Don’t upgrade your iDevice to the latest iOS version if your receive the update prompts.
* If you have installed some other description files, please delete them before you install this profile.
* It is uncertain if this description file can be used on iOS7 and iOS8.