Your prior radio view was with the "Professional Radio." The Business radio does not display presets and CD changer information in the lower section of the screen. To get the same view, you would have to upgrade the Z4's radio to the Professional version, if one is available.

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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