This firmware is not signed. This means you cannot restore to it in iTunes.
| Release Date | 03 April 2017 |
| Upload Date | 01 April 2017 |
| File Name | iPhone_5.5_10.3.1_14E304_Restore.ipsw |
| File Size | 2.58 GB |
| SHA256sum | 6636f2dccafda36410ecdf4c467cec753c4e2ccd29494566ff97789f386db88f |
| MD5sum | 915b5da280658a374d98b32529cd3a41 |
| SHA1sum | 179925221cd2f34cdcea5034d9d7c211712ce661 |
| Identifier | iPhone7,1 |
cd ~/Downloads.idevicerestore -e iPhone_5.5_10.3.1_14E304_Restore.ipsw and press Enter.