This firmware is not signed. This means you cannot restore to it in iTunes.
| Release Date | 19 November 2020 |
| Upload Date | 17 November 2020 |
| File Name | iPhone13,3_14.2.1_18B121_Restore.ipsw |
| File Size | 5.08 GB |
| SHA256sum | 2a424034bcadec7b841a686cb384ef852325d884c61d679723b716deeb244d10 |
| MD5sum | 3b593f3c0a096e08f85a2a96b3c7910e |
| SHA1sum | aca4eaa70fc99b5e6f90fd52178b18f41971a0ec |
| Identifier | iPhone13,3 |
cd ~/Downloads.idevicerestore -e iPhone13,3_14.2.1_18B121_Restore.ipsw and press Enter.