there is a rumor over in 3rd party DriverPack forum that the blue-tooth have multiple standards and were tempermental
and were abandoned as eligeble for a pack...
you should be able to get a single driver in a custom pack though... hmmm
are you sure the exe is getting called?
did you try it without the command line switches? IE "%DPSROOT%\D\3\BT\setup.exe"
to see if it launched in attended mode?
did you try running "c:\D\3\BT\setup.exe" /S /v/qn from a command line?
did you try "%DPSROOT%\D\3\BT\setup.exe" /S /v/qn from the finisher?
or """%DPSROOT%\D\3\BT\setup.exe"" /S /v/qn" ?
or ""%DPSROOT%\D\3\BT\setup.exe" /S /v/qn" ?
or """%DPSROOT%\D\3\BT\setup.exe"" /S /v/qn" ?
you might add the log switch
Logging Options
/le <LogFile>
e - All error messages
IE "%DPSROOT%\D\3\BT\setup.exe" /S /v/qn /le %SystemRoot%\BTinst.log ?
you can run the finisher over and over - simply use the directions for a SAD disk and only put your BT 3rd party DriverPack in the OEM folder instead of all the packs 
IE copy your OEM folder to the Local HDD (creating C:\OEM\) delete the main packs... except your BT Pack
and run the DP_Install_Tool.cmd as many times as neccessary till you got it workin 
how about that for a shortcut to test the finisher ?
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