BMW 335i MSD80 TO MSD81 retrofit. Older units have a lot of problems. Bigger one is mosfets. 30BA and 30BB internal error. Best option is updated MSD81. This service include: -second hand ECU MSD81 -matching immobiliser -flashing to newest software -coding vin to your car -adjusting IMA codes if provided To complete the job need CAS unit and key from the car. Everything takes 2 working days max. Normally do my job same day and send it back without post office - special one day delivery. I'm using best tools aviable on the market.