This 32Gb USB flash drive contains a full bootable install disk for macOS 11 (Big Sur). It can be used to rescue a dead hard drive, or SSD, or if your Apple Mac or MacBook Pro has stopped starting up. 


Unlike other similar eBay listings, this drive provides the FULL INSTALL version of the operating system, and not just upgrades. This means it can be installed on a completely blank or freshly formatted hard drive/ SSD as well as upgrading an existing operating system. 



Install Big Sur with USB Installer


For Apple Silicon, follow the steps below to install Big Sur USB Installer:

Step 1. Connect the bootable installer to an online Mac that may run the desired macOS version.

Step 2. Start the Mac by pressing and holding the power button until the Startup Disks pane appears.

Step 3. Choose the drive that has the installation and hit Continue. When prompted, follow the on-screen instructions to install macOS.

For Intel Macs, follow the steps below:

Step 1. Connect the bootable installer to an online Mac that may run the desired macOS version.

Step 2. Launch your Mac and hold down the Option (Alt) key until you see the Apple logo.

Step 3. Let go of the Option key when a black screen displaying your bootable volumes appears.

Step 4. Choose the disk from which the installer may be launched automatically. Then either hit Return or click the on-screen arrow.

Step 5. If asked, choose the language you prefer.

Step 6. From the Utilities tab, choose to Install macOS, then click "Continue" and follow the on-screen instructions.


If your Mac will not boot from USB, you will need to do the following:


Change the startup security settings to allow Mac start up from a USB:

  • Boot your T2 Intel-based Mac or M1 Mac in Recovery Mode. 
    For an T2 Mac, start up your Mac and meanwhile, press down Command - Option/Alt - R together until seeing the spinning globe appears on the screen.
    For an M1 Mac, shut down your Mac first. Then, hit down the power button (Touch ID) until the startup options shows up.
  • Click Utilities > Startup Security Utility from the menu bar in macOS Recovery mode.
  • Type your admin password if required to authenticate.
  • Reset the Secure Boot to Medium Security.
  • Check "Allow booting from external media" (on T2-based Mac) or "Allow booting from external or removable media" (on M1 Mac).
  • Exit macOS Recovery mode.


Please note -- if performing a fresh install of macOS 11, Big Sur, all previous data and settings on the hard drive will be lost, so ensure you have your files backed up.


Further instructions can be provided, if requested. If you have any difficulty with the installation process, send me a message on here and I can take you through it step by step if necessary.


Colour of USB drive may vary.