Give him his dues he paid in full. Painful lesson for both of us. I talked with some experts over in England with insider info and they more or less confirmed that the security update bricks the CAS if you try to clone a key without the dealer equipment. It is all to do with the rash of radio rebroadcast of the remote signal to open and disarm the vehicle thefts that are going on. Hard to drive off a vehicle with a dead CAS module.

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2021 X5 xDrive40i
2015 X5 xDrive35i MSport
(Traded) 2013 X5 xDrive35i