hdiutil convert /tmp/BigSur.dmg -format UDTO -o ~/Desktop/BigSur.cdr
Use the createinstallmedia tool provided by Apple to copy the installation files into the mounted DMG. big sur iso
Here is the step-by-step process using the Terminal: hdiutil convert /tmp/BigSur
Open the App Store on your Mac and search for "macOS Big Sur." Click "Get" to download the installer. Once downloaded, it will appear in your Applications folder named Install macOS Big Sur.app . Any pre-made "Big Sur ISO" found on third-party
softwareupdate --fetch-full-installer --full-installer-version 11.7.10
The search term refers to a demand for macOS 11 (Big Sur) packaged in the ISO disk image format . While ISO is the standard for Windows/Linux distributions, Apple does not officially provide macOS installers as ISO files. Official distribution uses the .app bundle (via Software Update) or .dmg / .pkg files. Any pre-made "Big Sur ISO" found on third-party websites is unofficial and carries significant security risks, including potential malware or modified system files.