launch the BigSurSharedSupportfix that should automatically copy the updated 12,3 GB SharedSupport.dmg (that is where the stage2 installer is stored) to the 16 GB USB drive (that acts as an updated BaseSystemfix Installer).download any 11.x beta InstallAssistant.pkg (12,4 GB) and run it to make the unpacked apple "macOS Install app" (other additional 12,5 GB) in its the default macOS (HighSierra, Mojave, Catalina, BigSur) Applications folder.restore the BigSurBaseSystemfix.dmg to a 16 GB USB empty drive (or to a 16 GB HFS+ partition external to an APFS container).
Sudo asr -source ~/Downloads/BigSurBaseSystemfix.dmg -erase -noverify -target /Volumes/YourUSBLabel
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