This firmware is not signed. This means you cannot restore to it in iTunes.
| Release Date | 28 January 2020 |
| Upload Date | 22 January 2020 |
| File Name | iPhone_4.7_13.3.1_17D50_Restore.ipsw |
| File Size | 3.46 GB |
| SHA256sum | e31085f1601e0dd9d0dfea6a021407de70f94b904fabaa9f2137a276c63e159c |
| MD5sum | d955380242e4851f35ee6b2197fa1e07 |
| SHA1sum | 90941bd17d68ba09d3719ca96f75c6038ff65c08 |
| Identifier | iPhone8,1 |
cd ~/Downloads.idevicerestore -e iPhone_4.7_13.3.1_17D50_Restore.ipsw and press Enter.