Unable to Download Big Sur 11.2.1 Solved
I did then try the internet recovery (option+command+R) at startup.
After a view minutes I got to the recovery screen and selected reinstall Big Sur, there it will download and install the latest compatible OS. So if you running Big Sur 11.0.1 and update 11.2.1 is available it will install 11.2.1 for you.
I did not loose any off my files or data averting is back just the way it was, the whole process takes time depending on your set-up and internet speed for me it was about 2 hours.
I hope this will help, It worked for me on a MAC Book Pro early 2015
wulf
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