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I am trying to make a Sierra Bootable USB stick with Terminal and I keep getting this error message : Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Couldn't posix_spawn: error 35"
I have tried various USB drives, computers and methods, nothing works. Is there a solution?
iMac 21.5", macOS 10.13
There is problem with making a bootable USB stick installer, been like that for 7 months now and Apple seem reluctant to do anything about it.
Usually the error reported is that Volumes/<USBName> is an invalid mount point, your error is different.
Have you downloaded the most recent version of Sierra available from here,
How to upgrade to macOS Sierra - Apple Support
at Section 4 you download InstallOS.dmg which you open to InstallOS.pkg.
Double-clicking on the InstallOS.pkg will open an installation window, this does not
install Sierra but creates Install macOS Sierra.app in your Applications folder.
With Install macOS Sierra.app in the Applications folder open Terminal and copy and paste this
sudo plutil -replace CFBundleShortVersionString -string "12.6.03" /Applications/Install\ macOS\ Sierra.app/Contents/Info.plist
press Return
enter your password
press Return
now enter the createinstallmedia command for Sierra in Terminal (MyVolume is Apples default name for a USB but you can enter the name of your USB in there.
sudo /Applications/Install\ macOS\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume --applicationpath /Applications/Install\ macOS\ Sierra.app
press Return and follow the prompts.
If you still end up with an error can you post a screenshot of your Terminal window.
There is problem with making a bootable USB stick installer, been like that for 7 months now and Apple seem reluctant to do anything about it.
Usually the error reported is that Volumes/<USBName> is an invalid mount point, your error is different.
Have you downloaded the most recent version of Sierra available from here,
How to upgrade to macOS Sierra - Apple Support
at Section 4 you download InstallOS.dmg which you open to InstallOS.pkg.
Double-clicking on the InstallOS.pkg will open an installation window, this does not
install Sierra but creates Install macOS Sierra.app in your Applications folder.
With Install macOS Sierra.app in the Applications folder open Terminal and copy and paste this
sudo plutil -replace CFBundleShortVersionString -string "12.6.03" /Applications/Install\ macOS\ Sierra.app/Contents/Info.plist
press Return
enter your password
press Return
now enter the createinstallmedia command for Sierra in Terminal (MyVolume is Apples default name for a USB but you can enter the name of your USB in there.
sudo /Applications/Install\ macOS\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume --applicationpath /Applications/Install\ macOS\ Sierra.app
press Return and follow the prompts.
If you still end up with an error can you post a screenshot of your Terminal window.
It worked!!! Thanks so much.
The macOS 10.12 Sierra installer is currently broken when it comes to creating a USB installer. Try creating a macOS 10.13 High Sierra USB installer instead:
Are you trying to create a bootable installer USB? Or are you trying to make a macOS bootable USB?
https://support.apple.com/en-us/HT201372
Bootable Installer and I tried that method, that is what I'm getting the error code with.
Downgrading from High Sierra on old iMac
Unable to make bootable USB drive
