Benz MBUX 2021 KSW
This theme was introduced in update Ksw-Q-Userdebug_OS_v3.5.3-ota, therefore it might not be available to activate on earlier firmwares.
To make this theme available for selection in your factory settings, you might need to modify your factory_config.xml file. Find the <SupportUIList /> section and add the following line: <Item id="1" name="Benz_MBUX_2021_KSW" display="Benz MBUX 2021 KSW" />. More information and examples can be found in factory settings section.