Standard macOS installations occur directly through the Mac App Store or System Preferences. However, these methods download a standard .app bundle into your Applications folder. A standalone DMG (Disk Image) file provides several advantages:
This article provides a comprehensive guide to obtaining the 11.2.1 installer, creating a bootable USB, and installing it safely. What’s New in macOS Big Sur 11.2.1?
: A clean install requires a stable internet connection and at least 50GB of free hard drive space to accommodate the installer and OS. macos big sur 1121 installer dmg
Complete Guide to Downloading and Creating a macOS Big Sur 11.2.1 Installer DMG
Once complete, you can restart any compatible Mac, hold down the key (or hold the Power button on Apple Silicon Macs), and select the USB drive to launch the installation suite. Standard macOS installations occur directly through the Mac
How to Download and Create a macOS Big Sur 11.2.1 Installer DMG
: A revised build (20D75) introduced a check to ensure your Mac has enough free space (35.5 GB) before starting, preventing potential data loss during the upgrade process. How to Obtain the Installer What’s New in macOS Big Sur 11
Specifically addressed an issue where some 2016 and 2017 MacBook Pro models were unable to charge past 1%.
If you intend to use the final DMG to create a bootable USB, connect the drive (at least 16GB capacity) and open Disk Utility. Select your USB drive, click "Erase", and format it as Mac OS Extended (Journaled) with a GUID Partition Map . Name your drive something simple like "MyVolume".