Before you ask for help, please try the troubleshooting steps below. We're happy to help you troubleshoot your bootability problems. Disk operations on the boot drive can be performed safely from a USB stick as. You can now run the operating system as normal and use this USB drive to boot up your Mac. &0183 &32 For both types of machines, use your keyboard’s arrow keys to select the USB drive from the list of bootable devices, click to confirm, and your USB drive will begin to boot.I also observed that, if I inserted the USB stick when the black screen occurred, the boot continued to the CloudReady (through the USB stick).Apple has never supported booting a new Mac from an OS that is older than what it shipped with. It may look like it has frozen in some places, but boot from USB can be slow, so please be patient.I could see the Welcome to Grub message and then the screen went black I checked each and every possible solution suggested in the forums for the black boot screen. No Mac will ever boot from an OS that is older than what it shipped withNow, boot with your USB stick, the config.plist has verbose enabled so you can see what is going on.
Windows Can'T See Usb Boot Stick Mac OS Than WhatApple Kbase #HT204350: Move your content to a new MacMacOS 11, "Big Sur" bootability troubleshootingStarting in macOS Big Sur, the system now resides on a "Signed System Volume". 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? You can access BIOS from Windows. Related DocumentationThe computers BIOS can toggle some of the problems that prevent a computer from booting with an external hard drive attached.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. Cloning macOS System volumes with Apple Software RestoreSometimes the Mac's firmware cannot detect your backup deviceWhen you boot your Mac while holding down the Option key, the Mac Startup Manager will display a list of available startup devices. 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.2012-vintage Macs can't boot macOS Catalina from an encrypted USB deviceWe have received several reports that the 2012 Mac mini and the 2012 MacBook Pro can initially boot from a non-encrypted external USB device, but then will fail to boot from that device when FileVault is enabled on the external device. If your Mac does not have a Firewire port, but has Thunderbolt ports, you can use the Apple Thunderbolt to Firewire adapter. Note that when partitioning a disk in Disk Utility, the top of the pie chart is the beginning of the disk in other words, the first partition starts at "noon".Possible workaround: If your external device has a Firewire interface, and your Mac is running an OS that is older than Catalina, then you can attach the device to your Mac via Firewire and boot from any size of volume. If you have an older Mac and you're having trouble booting it from a USB device that is larger than 2TB, try creating a 2TB partition at the beginning of the disk and make your backup to that partition. Some Macs may not boot from USB devices larger than 2TBSome Macs, especially those produced prior to 2014, cannot "see" the content of a volume that lies past the 2TB mark on the disk at boot. Alesis quadraverb patch editorEnable "External Boot" on T2 Macs (this is not required on M1 Macs)If you are attempting to boot a Mac with an Apple T2 controller chip (e.g. Some people have found that cloning Mojave to a RAID array can work, however this is not a supported configuration, and does not appear to be a viable option for macOS Catalina. Apple no longer supports booting Macs from RAID devicesStarting in macOS Mojave, Apple no longer supports installing macOS onto a RAID device. If you require an encrypted backup, we recommend that you erase your destination as APFS or HFS+ encrypted, then create a data-only backup to that volume.We reported this issue to Apple (FB7433465) in November 2019 and we are currently awaiting a response. This problem does not appear to be specific to any particular enclosure, rather it appears to be specific to the 2012 models of Mac mini and MacBook Pro. Choose Startup Security Utility from the Utilities menu in the menu bar ( see this screenshot for clarification) Restart your Mac while holding down Command(⌘) and the "R" keys. Apple describes the procedure in this Apple Kbase article, but the steps are: Can I leave this setting unchanged and change it only in the future when I actually need to boot from my backup?Generally no. Be sure to select a language that matches your keyboard, otherwise the Startup Security Utility may not accept your password. Do note the exception to this when attempting to boot one of these Macs from a different Mac's backup.Note for users with non-QWERTY keyboards: When you initially boot into Recovery mode, you'll be prompted to select a language. "Full Security" is the default setting, and that setting is compatible with booting a T2 from its own backup. Change the External Boot (or "Allowed Boot Media") setting to Allow booting from external mediaPlease do not, however, change the Secure Boot setting for the purpose of booting from a backup. ![]() Macs with "up-to-date software" don’t automatically load Option ROM firmware, so your Mac won't see devices that have Option ROM firmware until you load that firmware. Make the Startup Manager load additional driversSome third-party external devices use Option ROM firmware. In either case, if you want to encrypt your external, bootable backup of a T2-based Mac, we recommend formatting that backup volume as APFS. This may be a bug in the firmware of the T2 Macs, or it may be a limitation that Apple does not intend to address. Start up your Mac while holding down the Option key. Attach the backup disk directly to a USB or Thunderbolt port on your Mac ( no hubs, no adapters, no monitor ports, no daisy chaining, no third-party USB cards) Detach all peripherals from your Mac except for the keyboard and mouse (including any secondary displays) Troubleshoot discoverability issues in the Mac's Startup Manager Also, for good measure, use Disk Utility's "First Aid" utility to verify and repair any filesystem problems that may be present on the destination volume. Here's a partial list of devices we've received reports of that use Option ROM firmware:Rule out generally incompatible configurations and filesystem anomaliesIf you are using an external hard drive enclosure or adapter, see whether your enclosure is listed at the bottom of this page as an enclosure that we've seen problems with in the past. Detach, then reattach the backup volume's USB or Thunderbolt cable from/to your Mac and wait up to another 30 seconds. Press Option-Shift-Command-Period at the Startup Manager window to load any Option ROM firmware that is present and required for an external hard drive enclosure. If your backup volume appears at this step and the boot process proceeds past the Apple logo, skip to the section below. Then start it up holding down the Option key, waiting another 30 seconds for the volume to appear. If the backup volume still does not appear as an option, shut down your Mac completely.
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