The recent security update will update Mac bios at same time, and this update will not allow this Mac boot up from an external storage. You can refer the note below to enable external boot feature.
https://support.apple.com/en-us/HT205311
Q80021612 - While upgrading the Mac operating system with a security update, the Areca ARC-5028 failed to reboot, and we have been unable to select it as the boot disk since on that machine.
- Last update:
- 2022-01-06 07:32
- Author:
- Simone
- Revision:
- 1.1
You cannot comment on this entry
