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Bmw recognizes 10 keys for the vehicle with only 2 for CAS.
alot of time the battery located in the back of the key dies out, easy fix.
if the vehicle did "forget" the programming for the vehicle you can access it in ISTA and change the key numbers and profile number to "key 1" or "key 2" and it should all work again, also keep in mind your not suppose to "jump start" bmw's alot of things can go wrong.
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FBO obviously
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