Part 1: How to Make a MacOS Big Sur ISO File [11.4]

MacOS ISO Bg Sur 11.x.x

If you do not want to create an ISO – or you have Not a Mac – download ready iso from: BigSur_11.4.iso here


How to Download Full MacOS Installer from Mac Command Line


1-Followed this:

softwareupdate --fetch-full-installer --full-installer-version 11.4

# 11.4 is the most recent stable version as of this writing [slides 3-5]

2-Followed this:

In your Applications you must have a “Install macOS Big”

[slides 7-8]

3-After CMD Line commands continued
[slides 10-11]

1-First, we must create a temporary disk image:

hdiutil create -o /tmp/MacBigSur -size 14000m -volname MacBigSur -layout SPUD -fs HFS+J

2-Next, mount the disk image:

hdiutil attach /tmp/MacBigSur.dmg -noverify -mountpoint /Volumes/MacBigSur

3-Now we’ll use the createinstallmedia utility that is part of the MacOS Installer application to copy the installer files to the disk image you just created:

sudo /Applications/Install\ macOS\ Big\ --volume /Volumes/MacBigSur --nointeraction

4-Unmount/Detach the disk image volume

When finished, we then unmount/detach the disk image volume [slides 13-15]:
hdiutil detach /Volumes/MacBigSur/
2-way – if 1-way not working
Detach from Disk Utility

5-After unmount/detached the disk image volume continue in the Terminal [slide 17]:

We convert the freshly created macOS Installer disk image file to a CDR file that will appear on the desktop:

hdiutil convert /tmp/MacBigSur.dmg -format UDTO -o ~/Desktop/MacBigSur.cdr

6-Finally, we change the file extension from .cdr to .iso [slide 19]:

mv ~/Desktop/MacBigSur.cdr ~/Desktop/BigSur.iso

7-Conclusion [slide 20]

Now you have an iso file of Big Sur 11.x to use to install macOS Big Sur as VM in Hypervisors like VMware Workstation Pro [Windows/Linux], VMware Fusion [Mac], VirtualBox [Windows/Linux/Mac],…!

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