So if you use the 'emergency' interior door handle, do you still get an error message on 2021s? Why, if window lowers? And how do you remove it? We inadvertently used the mechanical handles when we test-drove a 2020 M3 (for what we remember), but never saw any error messages. We figured the button was for door locks . The mechanical handle looks perfectly positioned, so hard to know for a newbie it's the 'emergency' one.