Paste the copied curl command and hit the enter key on your keyboard to have the macOS Big Sur installer files be downloaded into a file named SharedSupport.dmg. Run the following command to create a directory named Contents on the Untitled drive as well as a sub-directory inside of Contents which is named SharedSupport:ġ2. Run the following command to change to the /Volumes/Untitled/private/tmp/Install macOS Big Sur.app directory:Ĭd 'private/tmp/Install macOS Big Sur.app'ġ1. Run the following command to copy the Install macOS Big Sur.app application from macOS Recovery to the /Volumes/Untitled/private/tmp directory.Ĭp -R '/Install macOS Big Sur.app' private/tmpġ0. Run the following command to create a directory named private on the Untitled drive as well as a sub-directory inside of private which is named tmp:ĩ. Run the following command to change to using the drive named Untitled:Ĩ. (This will save a lot of typing later.)ħ.

Copy the complete command which begins with curl. Scroll to the bottom of the KBase article and locate the Or use Terminal to reinstall section.Ĥ. Once the drive is erased, open Safari and go to the following URL:ģ. We’ll be using that drive name for the examples shown in this post.Ģ. Erase your Mac’s startup drive using the correct procedure for your Mac model:īy default, an erased drive is named Untitled. To install macOS Big Sur using the methods described above, use the procedure below:Ģ.

Using the Install macOS app to install macOS Big Sur.Using the curl tool to download the needed installer files onto the drive.Copying the Install macOS app available in macOS Recovery manually into the proper location on the drive.Creating the proper directory structure manually on the drive.Wiping the drive that you intend to install macOS Big Sur onto.This method is referenced in the following Apple KBase article: For more details, please see below the jump.

Using DFU mode and Apple Configurator on an Apple Silicon Mac? You need a second Mac to use this process and you just have the one Mac available.įor those situations, there’s one more option when you’ve exhausted all of the others. Building a USB installer? Left the flash drive in your other pants. Installing from macOS Recovery? Not working via the usual methods. Every so often, you may find yourself in a situation where you need to reinstall macOS Big Sur and everything is failing on you.

Download macos big sur installer