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Hi, my only key stopped working ( transponder) and i cant start car. Ordered a new key from BMW and it wont start car. Yellow line through key on dash. Used ISTA d to examine and all keys are disabled except the broken one hence why not starting. When trying to unlock key in ISTA, it asks for Terminal 15 to be on, ie a working key in slot of car.
Ive been to BMW and they have said new CAS, Keys and LOck. Does anyone have an idea of what i can do to get this running, thanks.

Have you tried the procedure described in ISTA (assuming you bought that new key from dealer)?
Insert the new remote key in the insertion slot and hold in this position until the remote key locks into place. This can take up to ten seconds. After locking, wait another five seconds. The remote key is then ready for use.