A good indi or a dealer should only charge you about one hour of labor for the coding and OS load. That will fix everything except the buzzing voice. That might be money well spent.

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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