How to create a bootable usb mac os sierra
I just randomly picked a date two years back: date 0416218002018.
Set the date back in time when the installer should be working. In the menu, select Utilities and then Terminal. A simple hack worked for me, thanks to this video on YouTube. You will run into an issue during installation when the installer will say it is damaged.
Press Y to confirm when asked to format the volume. Run the command /Applications/Install\ macOS\ Sierra.app/Contents/Resources/createinstallmedia -volume /Volumes// -applicationpath /Applications/Install\ macOS\ Sierra.app/ (Replace with your actual volume. Open Terminal and write sudo su, and enter your password when asked. Mount the DMG file, and copy the Installer macOS Sierra.app file to /Application
#How to create a bootable usb mac os sierra pro
I am using a 2017 MacBook Pro with Catalina, and the solution is a combination of a similar resolved issue on iFixIt forums and using unofficial downloads of the macOS Sierra DMG file. Libc++abi.dylib: terminating with uncaught exception of type NSException" Using a compatible Mac, simply launch the App Store, find Sierra from the homepage sidebar, and download the installer. *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Couldn't posix_spawn: error 35' Step 1: Download macOS Sierra from the Mac App Store To create a USB installer for macOS Sierra, you first need to download the installation application from the Mac App Store. (The drive I am trying to use is called 'Backup' and has been erased to become a 'macOS Extended (Journaled)' type drive.)Īfter entering my password and waiting for about two minutes I receive this error:
Sudo /Applications/Install\ macOS\ Sierra.app/Contents/Resources/createinstallmedia -volume /Volumes/Backup -applicationpath /Applications/Install\ macOS\ Sierra.app I have tried to follow these instructions but they haven't worked.
#How to create a bootable usb mac os sierra install
I have tried to create a bootable installer for macOS Sierra to use on my MacBook Air that is broken and needs to reinstall macOS (The macOS X Lion installer that comes with the Macbook is broken and says it is unable to install additional components needed to install macOS).