Are there any plans to supply Mac OSX firmware drivers for the FRDM KL25Z board?
"Note: The MSD Flash Programmer currently only operates correctly on Windows operating systems", quote from page 6 OpenSDA User's Guide.
I do not have a Mac :-(, but P&E has released a new firmware (V1.14) (https://www.pemicro.com/opensda/), so you might give it a try.