How to override browser name and other property values

[Redinbox]

Is there any way to update browser name in the config file while sending different browsers from testNG?

tried this way but not working
1st way
Properties props = new Properties();
ProjectConfig cfg = ConfigFactory.create(ProjectConfig.class, props);
props.setProperty("browser", browserName);
2nd way
ConfigFactory.setProperty("browser", browserName);
ProjectConfig cfg = ConfigFactory.create(ProjectConfig.class);

while retrieving browser name form config().browser its returns default browser name which is defined in general.properties