✗ This firmware is not signed. This means you cannot restore to it in iTunes.
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Download (5.24 GB)✗ This firmware is not signed. This means you cannot restore to it in iTunes. The instructions below are included for reference only.
iPhone_4.0_64bit_15.8_19H370_Restore.ipsw file that you downloaded.iPhone_4.0_64bit_15.8_19H370_Restore.ipsw file that you downloaded.cd ~/Downloadsidevicerestore -e iPhone_4.0_64bit_15.8_19H370_Restore.ipsw and press enter.cd DownloadsGet-FileHash iPhone_4.0_64bit_15.8_19H370_Restore.ipsw -Algorithm SHA1c4668a350a94cfbfb43389122fce27df4a747699. If it doesn't, you may need to redownload the file.cd ~/Downloadsopenssl sha1 iPhone_4.0_64bit_15.8_19H370_Restore.ipswc4668a350a94cfbfb43389122fce27df4a747699. If it doesn't, you may need to redownload the file.cd ~/Downloadsopenssl sha1 iPhone_4.0_64bit_15.8_19H370_Restore.ipswc4668a350a94cfbfb43389122fce27df4a747699. If it doesn't, you may need to redownload the file.| SHA256sum | 54fa6dc08bb273beef680faace6813cf29d32cb96997864fa53f445e2f5f16bc | 
                    
|---|---|
| MD5sum | a08fc7935a50c1f603fc17f199234c22 | 
                    
| SHA1sum | c4668a350a94cfbfb43389122fce27df4a747699 | 
                    
This update provides important bug fixes and security updates and is recommended for all users.
For information on the security content of Apple software updates, please visit this website:
https://support.apple.com/HT201222