This firmware is not signed. This means you cannot restore to it in iTunes.
| Release Date | 20 September 2021 | 
| Upload Date | 17 September 2021 | 
| File Name | iPad_Pro_A12X_A12Z_15.0_19A346_Restore.ipsw | 
| File Size | 6.05 GB | 
| SHA256sum | 23e82a86daa5d2d486ffa27bbb8881149c6d71f0e81b13a376180fb338b660ed | 
| MD5sum | e54689e20f56d185683d776bf9917037 | 
| SHA1sum | 1fd37c1470dbdda6a9a359bf82190db4b47e99f9 | 
| Identifier | iPad8,12 | 
cd ~/Downloads.idevicerestore -e iPad_Pro_A12X_A12Z_15.0_19A346_Restore.ipsw and press Enter.