Is it possible to install the 11.2.1 update OVER an existing 11.2.1 system? That used to be possible when combo updates were available (RIP combos). There is a Big Sur download available at App Store but I don't know if it's the whole shebang or just the update. (I suspect it's the entire OS.)
As far as I know, the App Store offers only
full installers, 11.2.1 is the one that's offered at the moment, and it mentions batteries only.
It also says that it was released yesterday, which perpetuates the date anomaly.
And SU hasn't offered me a new update as of the moment.
