sudo /Applications/Install\ macOS\ Big\ Sur.app/Contents/Resources/createinstallmedia --volume /Volumes/MyUSB
Advanced users can use Greg Janek’s open-source script (from GitHub) to fetch any signed version directly from Apple’s content delivery network. macos big sur 1121 installer dmg
Whether you are targeting an Mac? The exact error message text if a command failed? sudo /Applications/Install\ macOS\ Big\ Sur
A clean install wipes your hard drive and installs a fresh copy of macOS Big Sur. This is a great way to solve persistent software issues or start with a completely empty slate. A clean install wipes your hard drive and
softwareupdate --fetch-full-installer --full-installer-version 11.2.1 Use code with caution.
| Problem | Likely Cause | Solution | | :--- | :--- | :--- | | | The older 11.2.1 installer build didn't check for space correctly | Use the updated 11.2.1 (20D75) build which fixed this bug. If still stuck, free up extra space or perform a clean install | | Battery not charging past 1% (MacBook Pro 2016/2017) | A firmware issue that 11.2.1 directly addressed | Update to macOS 11.2.1 immediately. If already on it, consider an SMC reset | | Lost data or apps after upgrade | Interrupted installation due to the "no free space" bug | Restore from a Time Machine backup. If no backup exists, data recovery might not be possible | | Bluetooth not working after update | Persistent bug in early Big Sur releases | Reset NVRAM/PRAM and test in Safe Mode to isolate the issue |
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