Question: Can Xhorse vvdi2 read and write cas3 and 4 obd to change mileage?
Answer:
part of CAS4 can do
cas3 usually use file to change mileage
To correct mileage on BMW, you need to correct both on CAS box and Dashboard.
Question: I can write cas4 obd and remove dash to do the rest?
Answer: yes.. most cas4 ok
