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_Fall_2018_12.3_16F156_Restore.ipsw | 
| File Size | 3.51 GB | 
| SHA256sum | 5af5feb76985e2e56e6bac1b8e90e2544e24c07c0935079dd83fe247e26d4b11 | 
| MD5sum | 9a7755363e256cbaaafbaeb320532f2e | 
| SHA1sum | d5c506baf644a67053f40f8d5f5049ad643203fd | 
| Identifier | iPad8,3 | 
cd ~/Downloads.idevicerestore -e iPad_Fall_2018_12.3_16F156_Restore.ipsw and press Enter.