Hi Simon, yes there are the new settings of the black mode button.
-When power up:
- Click once to switch modes
- Quick click 2 times could repair the WiFi(and the light will blink slow), so you can pair the new WiFi under this status
- Quick click 3 times will enter reset(Light will blink fast then go to slow)
You can try point 2 nad 3 for the solution, more for reference here.