This firmware is not signed. This means you cannot restore to it in iTunes.
| Release Date | 13 May 2019 | 
| Upload Date | 08 May 2019 | 
| File Name | iPad_Pro_HFR_12.3_16F156_Restore.ipsw | 
| File Size | 3.04 GB | 
| SHA256sum | be8c6f1bc6621b8c64dd88db082fdaf7a4cb7cc01ba6b921f8abfc00441cf353 | 
| MD5sum | c14c6333a936aa0784b4186e61af0b4c | 
| SHA1sum | 75b85b412c9c99d0eb6930c462217b0b45c681b8 | 
| Identifier | iPad7,2 | 
cd ~/Downloads.idevicerestore -e iPad_Pro_HFR_12.3_16F156_Restore.ipsw and press Enter.