APPRO2 Mileage Correction Asks for Check Code?

 Problem:

When do BMW CAS4 mileage correction via OBD, the APPRO2 key programmer asks for a check code. Where can i get this code?

Solution:

Send the random code to our customer service: WHATSAPP: +8618350207975.

We will have APP2 engineer calculate the check code. It is free and very fast.