Try the following steps, hope it can help you.
1. First take off the top lid and the base of your Tank;
2. Anticlockwise to twist the remaining parts of glass (with great efforts or a tool when the first changing glass tube);
3. Replace and install the glass.
As far as I known that go to three quick clicks on "Modus Knob" button, then you can change the VW mode to CCW which is like customization for each half seconds of Watt, I guess VW mode is the Smart Wattage you mentioned above?
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