This firmware is not signed. This means you cannot restore to it in iTunes.
| Release Date | 16 May 2022 |
| Upload Date | 11 May 2022 |
| File Name | iPhone_4.0_64bit_15.5_19F77_Restore.ipsw |
| File Size | 4.88 GB |
| SHA256sum | 0a8ed259e3e7ef435ff79c3285f1aea36af48d5bedbf5c3a7c1444ba701e7bcb |
| MD5sum | d091f4d51113a47de5978d0bf6edf227 |
| SHA1sum | 2b0ebdd8a3a0f848970597f45ce5fb3ea7ffaf82 |
| Identifier | iPhone8,4 |
cd ~/Downloads.idevicerestore -e iPhone_4.0_64bit_15.5_19F77_Restore.ipsw and press Enter.