I have a customer that has an ECU he wants to swap in to his car (X5 diesel). It is already tuned. If I use autohex and sync CAS it typically reflashes the ecu, so would overwrite whatever is there. Do I have another way of doing this move in autohex or hextag?
Or read in hextag the P and D flash, then sync with autohex, then flash back the P and D flash?
Thanks