My Customer has damaged his dme on a f30 2014. He has supplied me with a used ecu which i think may have been virginised. When i first read isn in boot mode it came back with FF in all the boxes. So i then done a fem bdc unlock on the fem to retrieve original ISN. which i managed to get. Then I wrote the ISN retrieved from fem into the new Ecu, then re-read and it came back with 00 in all the boxes. Is there a problem with this ECU? Can anybody help? Thanks in advance.