If you want to build a 10.14 image, for example, the following steps must be performed on macOS 10.14! Note Apple's AutoDMG installer does not appear to work across OS versions. Install media now available at "/Volumes/Install macOS Catalina"Īpple also has guide on doing this via the GUI Disk Utility Creating an install image Contents/Resources/createinstallmedia -volume /Volumes/Installer -nointeraction Erasing disk: 0%. $ cd /Applications/Install \ macOS \ Ventura.app $ diskutil partitionDisk /dev/disk2 1 JHFS+ Installer 100% To create a bootable USB installer, mount a USB drive, and erase and partition it, then use the createinstallmedia utility: See Create a bootable installer for macOS, or run the utility without arguments to see how it works. Instead of booting from the network or using target disk mode, a bootable macOS installer can be made with the createinstallmedia utility included in Contents/Resources folder of the installer application bundle. $ codesign -dvv /Applications/Install \ macOS \ Ventura.app Executable=/Applications/Install macOS Ventura.app/Contents/MacOS/InstallAssistant_springboard Identifier= Format=app bundle with Mach-O universal (x86_64 arm64) CodeDirectory v=20400 size=640 flags=0x2000(library-validation) hashes=13+3 location=embedded Platform identifier=14 Signature size=4523 Authority=Software Signing Authority=Apple Code Signing Certification Authority Authority=Apple Root CA Signed Time=at 16:09:45 ist entries=32 TeamIdentifier=not set Sealed Resources version=2 rules=2 files=0 Internal requirements count=1 size=88 Creating a bootable USB installer This can also be done from the Terminal using the commands outlined in OSXDaily. Packet capture of an unencrypted HTTP conversation during macOS recoveryĪn alternative way to install macOS is to first download the latest version of macOS ( Latest: macOS Ventura) from Apple via the App Store and create a custom installable system image. However, this way exposes the serial number and other identifying information over the network in plain text, which may not be desired for privacy reasons. A system image can be downloaded and applied directly from Apple. The simplest way is to boot into Recovery Mode by holding Command and R keys at boot. Always prefer free and open source software ( which macOS is not).
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