This firmware is not signed. This means you cannot restore to it in iTunes.
| Release Date | 01 June 2020 | 
| Upload Date | 28 May 2020 | 
| File Name | iPad_Fall_2018_13.5.1_17F80_Restore.ipsw | 
| File Size | 4.15 GB | 
| SHA256sum | aa708ddc34362cc6329840ad119d54cef6775ceae24ff04235a183daf871c592 | 
| MD5sum | d6705260247d537ac9bdc4c199bc86c0 | 
| SHA1sum | 980a4efea0796dacec65a1a20b68066fc53d33bb | 
| Identifier | iPad8,5 | 
cd ~/Downloads.idevicerestore -e iPad_Fall_2018_13.5.1_17F80_Restore.ipsw and press Enter.