Hello, 21H2 currently beta version, we not supporting beta versions downgrade your windows if you want to keep use this cheat.
If you want to go back to 20H2 then Select Settings / Update / Windows update and click View update history. On top of history page is "Uninstall updates".
Open Settings on Windows 10.
Click on Update & Security.
Click on Windows Update.
Click the View update history option.
Click the Uninstall updates option.
Select the “Feature Update to Windows 10 22H2 via Enablement Package (KB5015684)” that matches the installation date.
Click the Uninstall button.
Click the Yes button to confirm.
Click the Restart now button.