Macos Big Sur Iso 2021 [hot] May 2026

hdiutil attach /tmp/BigSur.dmg -noverify -mountpoint /Volumes/BigSur Use code with caution. Copied to clipboard :

To create a macOS Big Sur ISO in 2021, you must use the Terminal to convert the official installer into a disk image. Apple does not provide ISO files directly; they only offer the Full Installer through the App Store. Apple Support Community Steps to Create a macOS Big Sur ISO Download and Prepare : Download "macOS Big Sur" from the Mac App Store Applications Create and Mount Image in Terminal to create and mount a blank 16GB disk image ( /tmp/BigSur.dmg Create Install Media createinstallmedia command to transfer the installer to the mounted volume: macos big sur iso 2021