sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia --volume /Volumes/UNTITLEDTo avoid getting a ‘Installation Failed’ message, you need to change the date before installing :
date {month}{day}{hour}{minute}{year}Set the Mac’s date to a date right around the time of release of the OS, e.g.
- 10.7 : Mac OS X Lion was released on July 20, 2011.
- 10.8 : OS X Mountain Lion was released on July 25, 2012.
- 10.9 : OS X Mavericks was released on October 22, 2013.
- 10.10 : OS X Yosemite was released on October 16, 2014.
- 10.11 : OS X El Capitan was released on September 30, 2015.
- 10.12 : macOS Sierra was released on September 20, 2016.
- 10.13 : macOS High Sierra was released on September 25, 2017.
- 10.14 : macOS Mojave was released on September 24, 2018.
- 10.15 : macOS Catalina was released on October 7, 2019.
- 11 : macOS Big Sur was released November 12, 2020.
- 12 : macOS Monterey was released on October 25, 2021.
When creating an Intel install media on an ARM-based Mac, the OS expects the createinstallmedia executable to be signed before running, but the Apple-made program isn’t.
You’ll encounter a zsh : killed. error otherwise.
Sign the program with the following :
codesign -s - -f createinstallmedia