The unit needs to be prepared as described above. Clear Mileage option is found in the “Keys And Start Synchronization Menu” and the “EWS Manager”, “EWS Functions” Menu > and the Clear Mileage option, which is a one-click solution at that point.
It is highly IMPORTANT to supply 13.6 Volts, or more, so that the procedures can run smoothly and finish successfully. An external power supply is a must.

Important notes
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Preparation is a one-off. If the unit has already been prepared for a key job, Clear Mileage is available without repeating it — see 9.2.
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The cluster is a separate matter; see 14 Mileage Information.