startup – Unable in addition macOS from an exterior machine on MacBook Professional M3

I’m attempting 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 executed thus far:

1. Initialized the exterior machine with a GUID partition map
2. Created an APFS partition on the machine
3. Downloaded the macOS 15.0 (24A335) installer instantly from Apple’s SWCDN
4. Ran the InstallAssistant.pkg and obtained a duplicate of Set up macOS
5. Launched Set up macOS and put in the OS on the exterior machine

Every part went easily up so far. Nonetheless, after the set up:

• I attempted deciding on my exterior machine because the startup disk and restarted the pc, however I acquired 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 record of bootable disks. However once I chosen it in addition, after some preliminary loading, nothing occurred.
• I additionally chosen the machine because the startup disk from restoration mode, however once more obtained the identical “The model of macOS on the chosen disk must be reinstalled.”
• I made positive that my Startup Safety Utility settings are set to “Decreased Safety” and that the machine’s info on Disk Utility reveals “bootable: sure”

I’ve beforehand put in and booted numerous working techniques 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 search out anybody with an identical challenge, and there’s little or no info obtainable. One web site briefly mentions that “It is not as straightforward because it was, because it doubtless requires you buy new {hardware}”, but it surely appears to check with needing a USB 3.1 or larger exterior machine, which I examined with a USB 3.2 pendrive with out success. One other weblog even gives a tutorial on ” Boot Intel/T2/M1/M2/M3 Mac from Exterior Drive”, which suggests this needs to be potential, however I haven’t had any luck. I learn another issues round, equivalent to naming the machine with no areas and altering the USB port to plug it into, however nothing labored.

I’d desire in addition macOS from an SD card within the built-in SD reader (for minimal muddle, even when it’s going to be sluggish), however I’m open to purchasing a brand new USB or Thunderbolt machine if it ensures success.

Has anybody encountered an identical drawback? Any solutions on find out how to resolve this?