⬢After you have removed the thermistor and the tapes, clean the entire board to remove any grease. You can leave the glue, which was under the aluminum tape.
⬢Place the thermistor on the heatbed. The tip of the thermistor must be in the circle.
If you miss this spot, the printer will read incorrect temperature values.
Note which side the sensor is attached to the heatbed.
⬢Take the silver aluminium tape and carefully peel off the protective film.
⬢Glue the tape to the heatbed, BUT ONLY in the centre of the thermistor (inside the circle shape). We need to double-check the correct position.
⬢Peel or bend the tape slightly, to reveal the tip of the thermistor.