This firmware is not signed. This means you cannot restore to it in iTunes.
| Release Date | 07 February 2019 |
| Upload Date | 05 February 2019 |
| File Name | iPhone_4.0_64bit_12.1.4_16D57_Restore.ipsw |
| File Size | 2.87 GB |
| SHA256sum | |
| MD5sum | e87f24838ca7f2de6d5af511c2c32921 |
| SHA1sum | b09aeeeb77a514191c5b97018e7fa136482a9560 |
| Identifier | iPhone6,2 |
cd ~/Downloads.idevicerestore -e iPhone_4.0_64bit_12.1.4_16D57_Restore.ipsw and press Enter.