I think you need to get a spare key and keep it in a secrect box on your X, weird that the only post you know how to make are because you locked your keys inside.... looks like you will have to break another window.... or just go to BMW and have a key made.

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Robert

1994 740iL
2001 X5 4.4i Sport
2004 Kawasaki ZX-6R
2009 VW Jetta S