Look here: Here are steps guide for using OBDSTAR X300M to correct VW NEC 24C32 VDO mileage.From original mileage 150111km to 100001KM.
Follow these steps to correct the mileage quickly:
Step1.X300m to the OBD port on VW
Step2. Start OBDSTAR X300M Mileage Correction Tool, choose CLUTER CALIBATE->VW->VW Vxx(latest version)->Select from Type->NEC 24C32 VDO->Read write mileage->Mileage adjustment
Step3.Turn ignition pls, Then X300M will automatically read the data
Step4.please enter a filename to save
Step4.to setup the new mileage; i input 100000
Step5. Make sure you turn igination on ,the press ENT to continue
One minute later，the the mileage adjustment complete!!!
We check it on the dashboard, the new mileage shows:100001 KM.
So, it’s successful.