A primary feature of the macOS Big Sur 11.2.1 installer is a critical fix for a battery charging issue
Download and Install macOS Big Sur 11.2.1 Apple released on February 9, 2021, as a critical update addressing a hardware issue that prevented some 2016 and 2017 MacBook Pro models from charging. This guide provides official and alternative methods to obtain the installer and create a bootable drive. Core Update Details Version: 11.2.1 macos big sur 1121 installer dmg