BMW e90 with water-damaged engine ecu, couldn't read original ecu anymore. I used a second one engine ecu and i renew cas2 easily with autel im608 you can follow the procedure by diagrams. The system ask you to put the key heartz the second hand ecu isn code(which it can be read by obd )
and the car chassis number. Then you write back to cas the renew eprom file and put it back on car. Did a cas dme synchronisation and boom the car is back on road.
Have fun friends life is easy with autel.
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