This firmware is not signed. This means you cannot restore to it in iTunes.
| Release Date | 23 January 2017 |
| Upload Date | 13 January 2017 |
| File Name | iPhone_4.0_32bit_10.2.1_14D27_Restore.ipsw |
| File Size | 1.84 GB |
| SHA256sum | 37296678eb3b6a1e4e19b5e6c1c9bd73426127f782d347871c51cddbcc3080e2 |
| MD5sum | 1a858151775952fd912ee17249cdb901 |
| SHA1sum | cef2111be93e40339abae934bb663d8099b088a2 |
| Identifier | iPhone5,4 |
cd ~/Downloads.idevicerestore -e iPhone_4.0_32bit_10.2.1_14D27_Restore.ipsw and press Enter.