I wanted to have 2 different MacOS versions on my computer, so I created a Bootable USB with BigSur Installer (did all of this on my Catalina OS). Doing this when the "it is necessary to make an update" screen appears and the computer will download the updates, make the update, automatically reboot, and you will be able to proceed with the installation without any problems.
TLDR On the "Startup Disk Selection Screen", that appears after holding Option, connect a wifi network by searching for yours on the dropdown list).
I faced this problem yesterday (and I solved it), here's the context:
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