If you own Mercedes with this kind of steering wheel and would like to do manual service reset and below is the step by step instruction to go through the process. Enjoy.
1) Close vehicle front bonnet, rear boot and 4 doors.
2) Switch on ignition to position 1
3) Ensure your speedometer is on mileage page. (refer to above picture)
4) Press "A" and "B" together approximately for 20 second, if you follow the instruction correctly you will see the below menu.
5) After press "A" and "B" button you will find this hidden menu appear on speedometer.
6) Select full Service. (for my case)
7) System will ask confirmation before go ahead, so we just carry on.
8) Here come to engine oil grade, for my case is 229.3
9) Finally assist plus will ask whether want to carried out for this case selected "Yes".
Please note this is non reversible after this step, unless you are using Xentry to undo.
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