


Therefore your first step after downloading the installer should be to cancel the install. If you run the macOS installer from the /Applications folder, the installer app will be deleted. MacOS is distributed through the App Store which will download an installer app to the /Applications folder. However, upon selecting my now formatted APFS drive it displayed a blank progress bar and after 10 minutes of nothing I called it off, installed Catalina and updated to Big Sur via Catalina.Use a USB flash drive (or other removable media) as a startup disk from which to install macOS. This worked and showed the beta installer. In macOS Catalina recovery, I connected the usb containing the Big Sur.app and then opened terminal, navigated to the volume and then manually launched the app.

It seems like it is Impossible to boot the macOS Big Sur installer to perform a clean installation as recommended by the developer notes. I rebooted and then re ran the update, same issue. Now I was presented with something along the lines of "There was an error updating"

I selected update, my Mac then proceeded to show the Apple logo with the progress bar and after about 3 minutes I was put into recovery. "An update is required to boot from this volume" However, upon entering safe mode I would get the message This seemed to have changed something because I was now able to boot from this Newly written USB. So what I did was is copy it to a secondary USB drive, boot recovery mode on my NEW MacBook, placed the 2nd usb and original USB into my NEW MacBook, and then ran the create install media from terminal in the recovery mode on the new MacBook. I suspected that it was maybe to do with the fact that I had downloaded the beta installer and wrote it to the USB drive on my OLD MacBook. Yet I had previously enabled "Booting from external volume" and enabled "No security" to allow the installation of unsigned media. However, when I tried this on my brand new 2020 MacBook Pro, it kept booting into internet recovery mode. I booted my MacBook Pro 13" 2015 from this USB drive, and it indeed booted into the macOS Big Sur recovery setup. I changed the paths around so that it used the macOS Beta installer and then it wrote the Big Sur installer to the USB. Hello, recently I tried to do a fresh install via a USB drive with create install media.
