In the recovery window, select if you want to wipe your internal drive for a clean install; otherwise, select Install macOS Big Sur to upgrade. Follow the on-screen prompts to complete the installation. Troubleshooting & Special Cases
Apple provides this DMG via the softwareupdate command or from the Mac App Store’s hidden “full installer” path. Third-party sites also host it, but verify the SHA-1 hash to avoid tampered versions. For developers, downloading via softwareupdate --fetch-full-installer is safest. macos big sur 1121 installer dmg
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