I’m making an attempt to put in macOS 15.0 (24A335) on an exterior reminiscence machine and boot from it on my MacBook Professional with the Apple Silicon M3 chip that runs the identical construct on the interior SSD. Right here’s what I’ve finished up to now:
- Initialized the exterior machine with a GUID partition map
- Created an APFS partition on the machine
- Downloaded the
macOS 15.0 (24A335)installer instantly from Apple’s SWCDN - Ran the
InstallAssistant.pkgand obtained a duplicate ofSet up macOS - Launched
Set up macOSand put in the OS on the exterior machine
Every little thing went easily up up to now. Nonetheless, after the set up:
- I attempted deciding on my exterior machine because the startup disk and restarted the pc, however I obtained the error message “The model of macOS on the chosen disk must be reinstalled.”
- I booted into restoration mode, and my exterior machine appeared within the listing of bootable disks. However once I chosen it besides, after some preliminary loading, nothing occurred.
- I additionally chosen the machine because the startup disk from restoration mode, however once more received the identical “The model of macOS on the chosen disk must be reinstalled.”
- I made certain that my Startup Safety Utility settings are set to “Decreased Safety” and that the machine’s data on Disk Utility reveals “bootable: sure”
I’ve beforehand put in and booted numerous working methods on my older Macs and PCs with no points, from unsupported macOSs to Home windows and Linux distros, because of the abundance of boards and guides on-line. This time, I’m struggling to seek out anybody with an analogous challenge, and there’s little or no data obtainable. One web site briefly mentions that “It is not as simple because it was once, because it seemingly requires you buy new {hardware}”, but it surely appears to seek advice from needing a USB 3.1 or increased exterior machine, which I examined with a USB 3.2 flash drive with out success. One other weblog even supplies a tutorial on “The best way to Boot Intel/T2/M1/M2/M3 Mac from Exterior Drive”, which suggests this ought to be attainable, however I haven’t had any luck. I learn another issues round, similar to naming the machine with no areas and altering the USB port to plug it into, however nothing labored.
I’d favor besides macOS from an SD card within the built-in SD reader (for minimal muddle, even when it’s going to be gradual), however I’m open to purchasing a brand new USB or Thunderbolt machine if it ensures success.
Has anybody encountered an analogous downside? Any ideas on methods to resolve this?