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Open your web browser and click this direct link to the macOS Big Sur App Store Page.
This comprehensive guide covers everything you need to know about acquiring, creating, and using a macOS 11.2.1 DMG file safely. What is macOS Big Sur 11.2.1?
Once you have the Install macOS Big Sur.app in your Applications folder, follow these steps to create a bootable installer. Requirements: A 16GB (or larger) USB flash drive.
Mount the newly created disk image to your filesystem so you can write data to it: macos big sur 1121 installer dmg
: For a pre-made DMG file, some users refer to the UUByte download guide .
Big Sur 11.2.1 specifically fixes a bug where the battery would not charge past 1% on 2016 and 2017 MacBook Pro models. Official Hardware Compatibility
If you ran into any error codes during the compilation or need help setting up the terminal commands, let me know: What your host computer is currently running? Open your web browser and click this direct
softwareupdate --fetch-full-installer --full-installer-version 11.2.1 Use code with caution.
The search phrase likely refers to . Apple also released a second version of 11.2.1, build 20D75, which fixed a separate installation issue. 11.2.1 was released on February 9, 2021, as a minor update to the previous macOS Big Sur 11.2.
While macOS has since moved on to Monterey, Ventura, Sonoma, and Sequoia, the remains a niche artifact for those managing older hardware or maintaining strict software compatibility environments. If you still need it today, prioritize security scanning—malicious actors have been known to repackage old OS versions with malware. Always verify the signature of any InstallAssistant.pkg before opening. Once you have the Install macOS Big Sur
Alternatively, if you still have the .app file, it is faster to skip the DMG step entirely for USB drives and target your external volume directly:
Early versions of the Big Sur installer were notorious for failing to check for sufficient disk space
20D74 (Initial release) / 20D75 (Revised release)
Press , enter your admin password, and wait for the process to complete. 4. Install macOS Big Sur 11.2.1 Once the drive is ready, follow these steps to install: Restart your Mac and immediately hold the Option (Alt) key. Select the Install macOS Big Sur volume from the boot menu.