Here's SIB 2420205 for harsh downshift for '04 and '05 X5 - replaced SIB 240106.
(won't work for a '00 - but SIB does exist)



Technical Service Bulletins for the BMW X5 2004 - 103000 POWER TRAIN - AUTOMATIC TRANSMISSION
Make : BMW Model : X5 Year : 2004
Service Bulletin Number: 2420205
Replacement Service Bulletin Number: 240106
NHTSA Campaign ID Number : 10014893
Date of Bulletin: 01/01/2006 Date Added to Database: 05/11/2005
Component: 103000 POWER TRAIN:AUTOMATIC TRANSMISSION
Summary: HARSH 2-1 DOWNSHIFT. *EH BMW E35. *SC X5 FROM 10/03 UP TO 04/05. *TT