Go to the dealer and pay them what they ask. I tried the cheap route and the vehicle got bricked by the key coder software/security package. $1100 for flatbed, troubleshooting, new CAS module and programming same. Then I had to buy the $500 key ANYWAY.
Just buy the key, its cheaper.

__________________
Sent via Telegraph Wires using my Morse Key.
2021 X5 xDrive40i
2015 X5 xDrive35i MSport
(Traded) 2013 X5 xDrive35i