The Sparkwood and 21 Shield logo with the words STUDIO NOTEBOOK underneath

How to erase MacOS Big Sur and return it to Catalina 🌲

2021-05-13

sudo /Applications/Install\\ macOS\\ Catalina.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume

https://flummox-engineering.blogspot.com/2019/08/macos-error-erasing-disk-error-number.html
also the error could be because it is called UNTITLED as something else is called that.