Technical Report: macOS Big Sur 11.2.1 Installer Release Date: February 9, 2021Build Numbers: 20D74 (Initial release), 20D75 (Revised release)Installer Size: ~12.23 GB to 12.6 GB for the full installer Executive Summary
Before we dive into the "1121" search, let's clarify what this build offers. Build 20D74 (macOS Big Sur 11.2.1) addressed critical security vulnerabilities (CVE-2021-3156) and fixed Bluetooth dropouts on older MacBooks. Unlike later 11.x updates, 11.2.1 avoids the "AppKit" bugs that broke some third-party plugins in Logic Pro and Adobe Suite. macos big sur 1121 installer dmg
A: No. A full functional DMG containing the installer app is ~12.7 GB. If yours is 10GB, it is missing the SharedSupport folder and will fail during installation. Redownload from a verified source. Technical Report: macOS Big Sur 11
Apple no longer lists 11.2.1 prominently, but the CDN link is still active. Open System Preferences > Software Update
Here is a proposed feature for the DMG:
System Preferences > Software Update.Option key and click Get (if hidden).This specific version was primarily released to solve two high-priority problems: