This firmware is not signed. This means you cannot restore to it in iTunes.
| Release Date | 21 March 2016 |
| Upload Date | 15 March 2016 |
| File Name | iPhone4,1_9.3_13E233_Restore.ipsw |
| File Size | 1.50 GB |
| SHA256sum | bc025f1924ef78100ce5ac0d63a4371ccaa86e632c96cb8e4d81432f072d14cf |
| MD5sum | 885599c9c52db8ca2be5f5f7f59cffda |
| SHA1sum | 989b535c7c5266f215752f3ac4de5a5f85e95784 |
| Identifier | iPhone4,1 |
cd ~/Downloads.idevicerestore -e iPhone4,1_9.3_13E233_Restore.ipsw and press Enter.