Create Almost Any MacOS Installation Media [Developer Betas | Old Versions] with gibMacOS
34#gibMacOS #MacOS #Installation #ISO
Full steps can be found at https://i12bretro.github.io/tutorials/0763.html
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Things You Will need
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- An existing MacOS Device or VM
- 30-40 GB of free disk space
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Downloading MacOS Installers
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01. Download gibMacOS https://github.com/corpnewt/gibMacOS
02. Extract the downloaded .zip file
03. Double click the gibMacOS.command file ≫ Click Open to confirm
04. If prompted to install Python, type Y ≫ Press Enter
05. Use the keyboard and on screen instructions to navigate the menus and download the desired version of MacOS
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Creating USB Installation Media
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01. Input a USB flash drive, 16GB or larger
02. In Finder, navigate to the gibMacOS folder /
03. Double click the InstallAssistant.pkg file to install it
04. Follow the prompts of the installer to complete the setup
05. Start LaunchPad from the dock
06. Search disk utility ≫ Click Disk Utility to launch it
07. Select the USB flash drive on the left side
08. Select Erase ≫ Set the Name to MacOSUSB and the Format to ExFAT ≫ Click Erase
09. Start LaunchPad from the dock
10. Search terminal ≫ Click Terminal to launch it
11. Run the following commands in terminal, altering the MacOS Installer name as needed
# write the installation files to USB flash media
sudo /Applications/Install\ macOS\ Ventura\ beta.app/Contents/Resources/createinstallmedia --volume /Volumes/MacOSUSB
12. When prompted, enter your password
13. Type Y and press Enter to confirm the action
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Creating a Bootable .iso
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01. Start LaunchPad from the dock
02. Search terminal ≫ Click Terminal to launch it
03. Run the following commands in terminal, altering the MacOS Installer name as needed
# create temporary disk image, make sure its larger than the downloaded installer
hdiutil create -o /tmp/macOS -size 13800m -volname macOS -layout SPUD -fs HFS+J
# mount the temporary disk image
hdiutil attach /tmp/macOS.dmg -noverify -mountpoint /Volumes/macOSISO
# use createinstallationmedia utility to copy files
sudo /Applications/Install\ macOS\ Ventura\ beta.app/Contents/Resources/createinstallmedia --volume /Volumes/macOSISO --nointeraction
# unmount the temporary disk image, alter the OS name as needed
hdiutil detach -force /Volumes/Install\ macOS\ Ventura\ beta
# convert the disk image to .iso
hdiutil convert /tmp/macOS.dmg -format UDTO -o ~/Desktop/macOS.cdr
# change the extension from .cdr to .iso
mv ~/Desktop/macOS.cdr ~/Desktop/macOS.iso
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