The company does that for security reasons and encourages iOS users to install the latest iOS update. Whenever Apple releases a new iOS update, it stops supporting the previous versions. Basically, it is an old file format to downgrade your iOS. When we say unsigned IPSW, it means that it is a file format that Apple no longer supports. This method will help you understand how you can download and install unsigned IPSW. Method 2: Use SHSH2 Blob to Install IPSW FilesĪnother method to try is using SHSH2 Blobs. Install the IPSW, Fixcon will take about 3 minutes to finish this process. ![]() Then select the IPSW version you desired for downgrade or upgrade. Connect your iPhone to computer, Fixcon will automatically detect your device. ![]() Launch Fixcon and click on Advanced Repair.
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