This firmware is not signed. This means you cannot restore to it in iTunes.
| Release Date | 20 July 2022 |
| Upload Date | 14 July 2022 |
| File Name | iPhone_4.0_64bit_15.6_19G71_Restore.ipsw |
| File Size | 4.87 GB |
| SHA256sum | 50cef48a7d48b8d724c9afffe42da86d107b50878842936b7ba6311f64eb6f9b |
| MD5sum | 0b213b4617218681f6fb93bb4efb24d5 |
| SHA1sum | cc6719f680ff4ba8679783c925142bb2496c896d |
| Identifier | iPhone8,4 |
cd ~/Downloads.idevicerestore -e iPhone_4.0_64bit_15.6_19G71_Restore.ipsw and press Enter.