The MKIII firmware has not changed since the V22 distribution disk. Therefore, you can download anything V22 or newer to get the latest OS for the MKIII. You can still get V26, V27x, and v28 from this link: http://www.xoutpost.com/articles/all-...ng-system.html

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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