Apple's page says that if you successfully updated to 1.2 BT Firmware this update isn't necessary.
Hope this helps!
Apple Bluetooth firmware
for DLink & internal BT modules
Version: 1.2.1
For failed 1.2 Firmware updates only
Feedback Type: Review
Contributed by: Lauterbach Wednesday, June 14 2006 @ 03:21 PM PDT
Product Platform: MacOSX
Used Product For: Over One Year
Recommend Product: YES
Comments
For failed 1.2 Firmware updates only - RAngol
Then why have it in the first place? Doesn't show up in software update and won't install on PowerBook G4. Am I supposed to look up last version of every minor update? Why isn't this in the VT description, Apple?Wednesday, June 14 2006 @ 03:46 PM PDT
For failed 1.2 Firmware updates only - Nedley
TNXsNC
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Wednesday, June 14 2006 @ 03:37 PM PDT