Make macOS High Sierra (10.13) installer USB from 19MB stub
mathewhillier Mar 13th, 2018 (edited) 1,065 Never
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- Create a macOS High Sierra (10.13) bootable installer USB stick (including starting from the 19MB installer stub).
- This technique does not require any third party tools unlike the OSX daily post below.
- It does require access to a Mac in order to use the App store and use of Terminal.
- Step by step procedure:
- Download the MacOS High Sierra installer from the App Store.
- When done, find the installer file in the /Applications folder.
- NOTE!!! Some users only get a stub installer of 19MB instead of the full 5.2GB installer package.
- See apple reason here https://support.apple.com/en-ph/HT201372 that "If you’re creating a bootable installer for macOS High Sierra, download from a Mac using High Sierra, Sierra 10.12.5 or later, or El Capitan 10.11.6.".
- Downloading when on other versions gives you the small installer stub.
- If you got the 19MB installer stub see 'a' below.
- If you got the 5.2GB full installer jump down to 'b' below.
- a) Starting from the 19MB stub installer:
- You will need to recreate the full installer from the separate parts.
- To do so we will use the installer stub app to grab all the files from Apple and then abort the install before it does anything else.
- Run the 19MB stub installer (/Applications/Install macOS High Sierra).
- Choose the install disk and click 'install' (it won't actually install yet!).
- It will download the remaining install files and place them under /macOS Install Data (i.e. look for the folder in the root of your hard drive 'Macintosh HD').
- When it has finished downloading all it needs, the installer screen will then ask you to restart the Mac - but don't! At this point ABORT the install by quitting the installer app.
- Next we will recreate the full installer from all the downloaded parts. This will restore the ability to create an install media USB. Do the following:
- Open Terminal and run: sudo -s
- Enter admin credentials to gain root permissions.
- Then copy and paste the following 3 commands:
- mkdir /Applications/Install\ macOS\ High\ Sierra.app/Contents/SharedSupport
- cd /macOS\ Install\ Data
- find . -mount | cpio -pvdm /Applications/Install\ macOS\ High\ Sierra.app/Contents/SharedSupport
- You now have a full installer package in your Applications folder!
- Continue with the steps below...
- b) Starting from the 5.2GB full installer:
- You need a blank USB stick. Note that the USB stick will be completely wiped as part of the process.
- Apple recommends at least 12GB of available storage.
- You can now use the createinstallmedia command to create the installer USB stick (in the following example the USB stick volume is named "MACOS" - change this to match the volume name of your USB stick). Example command:
- /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/MACOS --applicationpath /Applications/Install\ macOS\ High\ Sierra.app
- You will be asked to confirm the command by typing Y.
- It will do its stuff resulting in a USB labeled 'Install macOS High Sierra'.
- A discussion post by "Crazy Forthreed December 11, 2017 at 7:28 pm" at http://osxdaily.com/2017/09/27/download-complete-macos-high-sierra-installer/ for the combining commands.
- Apple https://support.apple.com/en-au/HT201372 lists createinstallmedia commands for each version of OSX/macOS.
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