You need to downgrade and then re-upgrade. The nav computer will not allow you to load the same version that is already installed on the system. But, it will let you downgrade or upgrade to any other version.

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SOLD
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