imac – “Your computer restarted because of a problem” when installing macOS Big Sur in external SSD?

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I have a 21.5 inch retina iMac (2017) which has a malfunction internal SSD, so Ive been using it with a SAMSUNG external SSD connected via USBC/Thunderbolt port to the iMac.


This has been working for a couple of years now, the problem is that I was on Mac OS Mojave and when I want to update either to macOS Sierra, HighSierra or Big Sur, the installation process fails and enters in one of the following scenarios:

  • Message “Your computer restarted because of a problem” when installing, this generates an infinite loop and the installation is never finished.
  • Just a infinite loop, for example when is in “Installing software update X%” it restarts and enters in a infinite loop.

I've tried installing macOS with a Bootable USB and with a Software update from Mac OS Mojave, none of this works.

Is there anything that I can do? If I go and install Mac OS Mojave, everithing goes well.

Also is important to mention that anytime I try to do a bootable USB installation, I erase the SSD to “AFPS” and rename it to “Macintosh HD”.

Thanks in advance

Author: Subham

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