Go to realoem.com and price every electronic module then add that total to the purchase price to get the start of an idea of how much it could cost you to get it running. Sure you could get lucky but the other alternative is a strong possibility.
I did not even get into bodywork, fixtures and mechanical parts that also may require replacement.

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