This firmware is signed. This means that you can restore to it in iTunes.
| Release Date | 11 May 2026 |
| Upload Date | 01 May 2026 |
| File Name | iPhone_4.0_64bit_15.8.8_19H422_Restore.ipsw |
| File Size | 4.87 GB |
| SHA256sum | 9a36579735386cc7844cd255185f9413f0bc72a97da60bddbf7f8485f596736f |
| MD5sum | 4bb594ea9fe58b5ce4ff279645e8b991 |
| SHA1sum | cf4309309ba1194915669302db5394c03c635180 |
| Identifier | iPhone8,4 |
cd ~/Downloads.idevicerestore -e iPhone_4.0_64bit_15.8.8_19H422_Restore.ipsw and press Enter.