This firmware is signed. This means that you can restore to it in iTunes.
| Release Date | 03 May 2021 |
| Upload Date | 27 April 2021 |
| File Name | UniversalMac_11.3.1_20E241_Restore.ipsw |
| File Size | 12.98 GB |
| SHA256sum | 0ed07e6e1c0401f9e81f8f3a649466c40c5521ac9296f4cac9962e425ed84dfe |
| MD5sum | 6659d47f890423c8ca043a771042c097 |
| SHA1sum | e6fd12bda1fd7267cad0c8189b00210ac4009a60 |
| Identifier | MacBookPro17,1 |
cd ~/Downloads.idevicerestore -e UniversalMac_11.3.1_20E241_Restore.ipsw and press Enter.