Hi Michael,
I also did a porting for TWR-K60F120M, and run the Host MSD demo(C:\Freescale\Freescale USB Stack v4.1.1\Source\Host\examples\msd) with TWR-SER2, the result is ok . Please kindly refer to the following for details.

Which demo did you port? Is it the same demo? Please kindly help to clarify.
Have a great day,
Kan
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