This firmware is not signed. This means you cannot restore to it in iTunes.
| Release Date | 28 January 2020 | 
| Upload Date | 22 January 2020 | 
| File Name | iPad_Fall_2018_13.3.1_17D50_Restore.ipsw | 
| File Size | 4.04 GB | 
| SHA256sum | d377c5bd375cab6968f54bbf06a4925fe4d791883a066c865faea4e4a2a6df62 | 
| MD5sum | a136f40cd7f87d12630f2d5bba1f1e4f | 
| SHA1sum | 170a6bd7851cc236fbea5f6d892af12d7afa2a32 | 
| Identifier | iPad8,3 | 
cd ~/Downloads.idevicerestore -e iPad_Fall_2018_13.3.1_17D50_Restore.ipsw and press Enter.