Hello Gionatha,
SD application requieres to add some function related to SD functionality.
I made a MSD + HID application based on FRDM-K64F's HID+AUDIO example, you can consult this post, (I did test this example using SD functionality and It worked well): USB Composite HID-MSD device does not start
I hope this can help you,
Best Regards,
Isaac
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