Using only device drivers that are stored on your Mac's firmware chip, the firmware will scan all of your SATA, PCI, USB, and Thunderbolt busses for hard drive devices, then read those hard drive volume headers to determine if a macOS system is available on each volume. When you boot your Mac while holding down the Option key, the Mac Startup Manager will display a list of available startup devices. ![]() Sometimes the Mac's firmware cannot detect your backup device Cloning macOS System volumes with Apple Software Restore.Some Big Sur startup volumes don’t appear in the Startup Disk Preference Pane.If that does not produce a bootable device, then the device is not suitable for functioning as a bootable device on your Mac. If that does not produce a bootable volume, and if you have exhausted the Firmware Discoverability Troubleshooting steps below, then we recommend that you install macOS onto the backup. When you make a backup of a Big Sur startup disk with CCC 5.1.23 or later, CCC will automatically use Apple's proprietary APFS replication utility (ASR) to make an exact copy of the source. This volume is cryptographically sealed, and that seal can only be applied by Apple ordinary copies of the System volume are non-bootable without Apple's seal. Starting in macOS Big Sur, the system now resides on a "Signed System Volume". MacOS 11, "Big Sur" bootability troubleshooting Apple Kbase #HT204350: Move your content to a new Mac.Apple Kbase #HT2186: Don't install older versions of Mac OS than what comes with your computer.Can I back up one computer and use the clone to restore another computer?.If you're trying to migrate content to a new Mac, use Migration Assistant for that purpose - do not attempt to restore an older Mac's backup onto a new Mac. No Mac will ever boot from an OS that is older than what it shipped withĪpple has never supported booting a new Mac from an OS that is older than what it shipped with. If you're having trouble with the steps or have run out of options, please let us know how far you got, or how far your Mac gets into the boot process. Before you ask for help, please try the troubleshooting steps below. If it becomes disconnected, power off your computer, reconnect it, and start over.We're happy to help you troubleshoot your bootability problems. Never disconnect the MacBook Air Software Reinstall Drive from the USB port until the installation of software has completed. Do not use USB hubs, switches, or USB ports on an Apple LED Cinema display (or other display) with the MacBook Air Software Reinstall Drive.Ĭan I disconnect the MacBook Air Software Reinstall Drive from the USB port when installing software? What is the best way to connect the MacBook Air Software Reinstall Drive to my computer?Īlways connect your MacBook Air Software Reinstall Drive directly to your computer’s USB port. I connected my MacBook Air Software Reinstall Drive to a hub or USB switch and it won’t install. ![]() ![]() How do I get QuickTime 7 to play older video formatted content? To install CD and DVD Sharing on a PC running Windows, download and install that software. You can use another Macintosh running Mac OS X v10.5.3 or later to share its optical drive with your MacBook Air (Late 2010). After you have reinstalled the software with the MacBook Air Software Reinstall Drive, run Software Update before using a printer.ĭoes MacBook Air Software Reinstall Drive contain software for CD/DVD Sharing? Apple adds support for additional printer models frequently. You can install a limited selection of print drivers using the MacBook Air Software Reinstall Drive. ![]() The Boot Camp Assistant will download the correct Windows 7 drivers for your computer and offer to copy them to a CD or USB storage device.ĭoes MacBook Air Software Reinstall Drive include any printer drivers?
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