This firmware is not signed. This means you cannot restore to it in iTunes.
| Release Date | 31 October 2017 |
| Upload Date | 20 October 2017 |
| File Name | iPhone_4.0_64bit_11.1_15B93_Restore.ipsw |
| File Size | 2.48 GB |
| SHA256sum | f42538302694d042c1cf98a6e31cf86b405e2f9ace9dafe5371a15ca122daac4 |
| MD5sum | 73e97df4655a3e99eeac5c63187b5608 |
| SHA1sum | 94e5c6753e3c07e520ee9d8f6c6fa959ff04aa55 |
| Identifier | iPhone8,4 |
cd ~/Downloads.idevicerestore -e iPhone_4.0_64bit_11.1_15B93_Restore.ipsw and press Enter.