This firmware is not signed. This means you cannot restore to it in iTunes.
| Release Date | 29 March 2018 |
| Upload Date | 16 March 2018 |
| File Name | iPhone_4.0_64bit_11.3_15E216_Restore.ipsw |
| File Size | 2.53 GB |
| SHA256sum | 16664ae367f3c9a4752e675a4e0b52c1816bfe6eaea60ee124bb90e42696a5f4 |
| MD5sum | 12c58703791d2cfa93c920b0f9565f34 |
| SHA1sum | 980122dcb7e743422cced3458324f6394a6aa224 |
| Identifier | iPhone6,1 |
cd ~/Downloads.idevicerestore -e iPhone_4.0_64bit_11.3_15E216_Restore.ipsw and press Enter.