I have managed to change mileage on a Fiat 500 year 2013 successfully using OBDSTAR X300 Pro3key programmer (same as green color OBDSTAR key master) by OBD. Original Odometer: 74407 KM Fiat 500 2013 Odometer Correction Procedure: Connect X300 pro3 host with vehicle via diagnostic socket Select Vehicles->Mileage Adjustment->Fiat->Fiat V30.64 Loading bin and initializing… Then choose Fiat…