This firmware is not signed. This means you cannot restore to it in iTunes.
| Release Date | 22 January 2019 |
| Upload Date | 11 January 2019 |
| File Name | iPhone_4.7_12.1.3_16D39_Restore.ipsw |
| File Size | 2.91 GB |
| SHA256sum | ac01e851f5b2f4b63faebb310bb96939da4187e1014bcc744fee00ce91b28ab4 |
| MD5sum | 617282ab3d0a7285a10e4600bd2e90fa |
| SHA1sum | bb801eadd069555f068aaaba16d87fa312d66b08 |
| Identifier | iPhone8,1 |
cd ~/Downloads.idevicerestore -e iPhone_4.7_12.1.3_16D39_Restore.ipsw and press Enter.