If you are looking to revert your Samsung TV to an older firmware version, the short answer is that . Once an update is installed, the system is designed to block any installation files with a version number lower than the one currently active. The Reality of Downgrading
For models like the KS, MU, NU, RU, Q6-Q9 series (2016-2019), you can access the service menu: Samsung Tv Downgrade
While users often want to downgrade their Samsung TV firmware to resolve issues like reduced screen brightness, aggressive local dimming, or UI lag introduced by recent updates, Samsung does not officially support firmware downgrades The Official Stance If you are looking to revert your Samsung
Warning: The following methods can brick your TV (turn it into an expensive paperweight). Do this at your own risk. The author and platform are not responsible for damage. Do this at your own risk