Now booted from USB thumb drive with bootable Big Sur installer. I have given up on the option of Restoring on line due to 4 hr estimated time. I was able to access Recovery and used DU to run repairs but upon restart same issue persists. I was unable to boot from my TM backup, also made yesterday prior to updating, the Option screen does not even display TM as a boot option. While attempting to perform the process I described in post #2 I found that I was unable to boot from yesterday's CCC backup made prior to the macOS 11.3 update.Īfter attempting to re boot with the 11.3 internal drive I found i could not keep the MBP running for more than 30 secs or so before it would reboot again.Įverything I have tried resulted in a re boot after login. Please continue to make Time Machine backups. Messy and a bit complicated but until Apple provides a fix for their replicator, that's the only way we can create a bootable clone. Afterward, you will have a clone of 11.3 which will boot.
You will then have to boot with that drive (which contains the pre-boot info from 11.2.1) and allow the update to 11.3 to be installed to the drive. The drive will still be bootable but will contain the pre-boot information from Big Sur 11.2.1. The only work around is to keep the CCC drive intact (do not erase it) and then allow CCC to copy the new "Data" portion of Big Sur 11.3 to the drive.
You will be left with a copy of your "Data" portion, however, it will contain no pre-boot information and therefore will not be bootable. CCC will only copy the "Data" portion of your Macintosh HD and not the System portion. If you erase your CCC drive and then expect CCC to replicate Big Sur 11.3 to the newly erased drive, it will not work. This method no longer works using CCC 5.1.26 with Big Sur 11.3.
In other words allowing CCC to make a new clone of the latest version of Big Sur. Prevously the way to make a new clone using CCC and Big Sur was to wipe the CCC external drive and start over.
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