Macos Big Sur Iso 2021 [portable] | 2K 2027 |

While macOS Big Sur (version 11) officially retired in September 2023 , it received a surprise security update ( version 11.7.11 ) as recently as February 2026 to maintain FaceTime and Messages functionality until 2027.

Download the Installer:

Get "Install macOS Big Sur" from the App Store. macos big sur iso 2021

Control Center

: A new dedicated panel for Wi-Fi, Bluetooth, and brightness controls, mirroring the iPhone experience. While macOS Big Sur (version 11) officially retired

Full Installers

: The official full installer (approx. 12GB) could be used to create bootable USB drives or custom ISOs, with versions like 11.2 available on archives like the Internet Archive . Full Installers : The official full installer (approx

Because you are using a specific 2021 build, you might encounter these issues:

11.4 (20F71)

Since you specifically want the 2021 version (not the final 11.7.10 release), you must fetch the specific build number. For Big Sur 2021, the target build is or 11.3 (20E232) .

Mount the Image

hdiutil create -o /tmp/BigSur -size 16384m -volname BigSur -layout SPUD -fs HFS+J Use code with caution. Copied to clipboard :