Upgrading system to macOS Big sur might come across with multiply problems for example MacBook sound not working, brightness problem, camera not working. One of soulution is to wait for another update or bring macbook to previous macOS version.
Sometimes mac software getting crazy and changing main settings. Best check all levels and sound effects
you can check that in Apple logo > System preferences > Sound > Output/Sound effects
If all above looks right next step is:
PRAM RESET
Resetting PRAM should deload memory and fix all software issues.
Turn off your mac device and wait for black screen, after few seconds hold down Command, option, P and R keys on your keyboard and release them when Apple logo shown up or head startup chime.
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