This firmware is not signed. This means you cannot restore to it in iTunes.
| Release Date | 01 October 2021 |
| Upload Date | 29 September 2021 |
| File Name | iPhone_4.0_64bit_15.0.1_19A348_Restore.ipsw |
| File Size | 4.99 GB |
| SHA256sum | 5f99518217bafda3037590e50398f1953eced02675823e02c7ee7232bb268f4d |
| MD5sum | 341334cf305b608ed3cf2f5f4697493c |
| SHA1sum | 3e43cdc95adf04fe36f6ae9e78fe5396688d553f |
| Identifier | iPhone8,4 |
cd ~/Downloads.idevicerestore -e iPhone_4.0_64bit_15.0.1_19A348_Restore.ipsw and press Enter.