Is there any possibility that there is a disk already in the nav computer?

I am guessing that there is a disk in the unit already. You may have to partially disassemble it to verify and then remove it. Maybe that will clear it up.

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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