This firmware is not signed. This means you cannot restore to it in iTunes.
| Release Date | 14 December 2020 |
| Upload Date | 11 December 2020 |
| File Name | iPhone_4.0_64bit_12.5_16H20_Restore.ipsw |
| File Size | 2.81 GB |
| SHA256sum | d210c71c434a24ff7dc7816082c9bbb434908e783d8379737e53823c03044d66 |
| MD5sum | 89767e26cff6f426a263f488c89c0155 |
| SHA1sum | 2138cde9e348f08cca562500eed153ce1f5bfeb3 |
| Identifier | iPhone6,1 |
cd ~/Downloads.idevicerestore -e iPhone_4.0_64bit_12.5_16H20_Restore.ipsw and press Enter.