✗ This firmware is not signed. This means you cannot restore to it in iTunes.
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Download (7.43 GB)✗ This firmware is not signed. This means you cannot restore to it in iTunes. The instructions below are included for reference only.
iPhone11,8_17.2.1_21C66_Restore.ipsw file that you downloaded.iPhone11,8_17.2.1_21C66_Restore.ipsw file that you downloaded.cd ~/Downloadsidevicerestore -e iPhone11,8_17.2.1_21C66_Restore.ipsw and press enter.cd DownloadsGet-FileHash iPhone11,8_17.2.1_21C66_Restore.ipsw -Algorithm SHA11fcf5997774e44da4371552792b7beff5136582b. If it doesn't, you may need to redownload the file.cd ~/Downloadsopenssl sha1 iPhone11,8_17.2.1_21C66_Restore.ipsw1fcf5997774e44da4371552792b7beff5136582b. If it doesn't, you may need to redownload the file.cd ~/Downloadsopenssl sha1 iPhone11,8_17.2.1_21C66_Restore.ipsw1fcf5997774e44da4371552792b7beff5136582b. If it doesn't, you may need to redownload the file.| SHA256sum | 4b375b50c57c48453bce38233598677346f9746382838f36d9662280b9482e2c | 
                    
|---|---|
| MD5sum | 1db9467d8d2b4dd097c11e8db4ad26dc | 
                    
| SHA1sum | 1fcf5997774e44da4371552792b7beff5136582b | 
                    
This update provides important bug fixes and is recommended for all users.
For information on the security content of Apple software updates, please visit this website:
https://support.apple.com/kb/HT201222