This firmware is not signed. This means you cannot restore to it in iTunes.
| Release Date | 26 August 2019 |
| Upload Date | 22 August 2019 |
| File Name | iPhone_4.0_64bit_12.4.1_16G102_Restore.ipsw |
| File Size | 2.93 GB |
| SHA256sum | 9f5e80e0c18ca3030db5d5d9d2ec21c683e80eb2bf3669d043726f4a6ad9a799 |
| MD5sum | 1a671f2041809cf24fc6e16ed252fa2c |
| SHA1sum | d3497fae42b7efc18d657b03fbac1a43bc4c08da |
| Identifier | iPhone6,1 |
cd ~/Downloads.idevicerestore -e iPhone_4.0_64bit_12.4.1_16G102_Restore.ipsw and press Enter.