Can't get open core or any other tool to create install media for the macOS big sur beta 1/2 I don't know for a 2012 Mac mini

this is the error it gives me: Failed to create macOS installer

Output: Started erase on disk4

Unmounting disk

Creating the partition map

Waiting for partitions to activate

Formatting disk4s2 as Mac OS Extended with name OCLP-Installer

Initialized /dev/rdisk4s2 as a 14 GB case-insensitive HFS Plus volume

Mounting disk

Finished erase on disk4

Error: /var/folders/h_/xjmx3b4j3hz_26p6glk3n0kr0000gn/T/tmp8i274zah/payloads/Installer.sh: line 5: 70358 Killed: 9 "/var/folders/h_/xjmx3b4j3hz_26p6glk3n0kr0000gn/T/tmprv1k0d58/Big Sur Beta 1.app/Contents/Resources/createinstallmedia" --volume /Volumes/OCLP-Installer --nointeraction

Can someone help me. I specifically want beta 1 of 11.0 on this computer