This firmware is not signed. This means you cannot restore to it in iTunes.
| Release Date | 10 February 2022 | 
| Upload Date | 07 February 2022 | 
| File Name | iPad_Pro_A12X_A12Z_15.3.1_19D52_Restore.ipsw | 
| File Size | 6.09 GB | 
| SHA256sum | 3096ab91913e1780150e926dabdef4b09ef4b2e8f6241e4389b99d9b8c2b3dfe | 
| MD5sum | df47c3a2f6e1f4fbfa76a1950f70c315 | 
| SHA1sum | 6904c32ad5951e742671206c6bf5bc9c15dd90f9 | 
| Identifier | iPad8,9 | 
cd ~/Downloads.idevicerestore -e iPad_Pro_A12X_A12Z_15.3.1_19D52_Restore.ipsw and press Enter.