This firmware is not signed. This means you cannot restore to it in iTunes.
| Release Date | 09 December 2014 |
| Upload Date | 05 December 2014 |
| File Name | iPhone5,1_8.1.2_12B440_Restore.ipsw |
| File Size | 1.49 GB |
| SHA256sum | 66c89babbf532c9cd5f9efb7cc3800bf89b620bad19a76c95641879e173c43ec |
| MD5sum | eafbde08566e06624c0d2fe0d9f3efa6 |
| SHA1sum | 55e79628252e680065ba2a40588fc1dce5374ef3 |
| Identifier | iPhone5,1 |
cd ~/Downloads.idevicerestore -e iPhone5,1_8.1.2_12B440_Restore.ipsw and press Enter.