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Are you talking about a No Power situation? If so, BMW says that the procedure should only be done be BMW Service personnel. If you have no power, and your X3 is dead by the side of the road, the procedure just isn't going to happen. It requires that an underbody panel be removed, and then that a set screw be tightened to release the transmission. Without a jack and jackstands, that ain't safely happening. BMW Roadside Assistance typically doesn't have a clue what the procedure is, nor do they typically have the equipment to safely execute it.
The Google is your friend. "GA8HP Automatic Transmission" is a great keyword string to try. See what you find, and note that the X5 E70 uses the same GA8HP transmission.
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