If you want to go the safest route, you can just buy the update disk directly from BMW for $7. It is part number 01.59-0 141 891. Check out Tischer BMW (getBMWparts.com) to order it there. That way, you do not have to worry about burning it correctly.

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2000 E38 750iL Highline Edition, Upgraded with the lastest 2006 X5 Electronics
MKIV Navigation, 16:9 Display, Bluetooth, TV/Video with Backup Camera, Sirius, and Aux Input